CN106414805B - Chemical cleaning method and chemically-cleaning device - Google Patents

Chemical cleaning method and chemically-cleaning device Download PDF

Info

Publication number
CN106414805B
CN106414805B CN201580028213.8A CN201580028213A CN106414805B CN 106414805 B CN106414805 B CN 106414805B CN 201580028213 A CN201580028213 A CN 201580028213A CN 106414805 B CN106414805 B CN 106414805B
Authority
CN
China
Prior art keywords
cleaning
cleaning solution
chemically
iron rust
component
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201580028213.8A
Other languages
Chinese (zh)
Other versions
CN106414805A (en
Inventor
下田翔
椿崎仙市
吉田茂
大久保宏树
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Power Ltd
Original Assignee
Mitsubishi Hitachi Power Systems Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2014139043A external-priority patent/JP5721888B1/en
Priority claimed from JP2014139044A external-priority patent/JP6522293B2/en
Application filed by Mitsubishi Hitachi Power Systems Ltd filed Critical Mitsubishi Hitachi Power Systems Ltd
Publication of CN106414805A publication Critical patent/CN106414805A/en
Application granted granted Critical
Publication of CN106414805B publication Critical patent/CN106414805B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
    • C23G1/26—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions using inhibitors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The present invention provides a kind of chemical cleaning method and chemically-cleaning device for removing removing rust.By the cleaning solution comprising rust remover by medical fluid supply pipeline (102) directly to cleaning object equipment (10) supply with the component for being attached with iron rust, the rust remover is the mixture of chelating agent, reducing agent or chelating agent and reducing agent.Implement chemical cleaning by the region for being attached with iron rust being at least impregnated in cleaning solution, and the oxidation-reduction potential of cleaning solution is maintained the value for dissolving out iron rust in cleaning solution, thus iron rust is dissolved out from component and is removed.

Description

Chemical cleaning method and chemically-cleaning device
Technical field
The present invention relates to for removing the chemical cleaning method and chemistry that are attached to the iron rust of water screen tube inner surface etc. Cleaning device.
Background technique
Thermal power generation system 1 illustrated by Figure 20 has direct current cooker 10.As the water system of boiler, it is provided with condensation Device 20, condensation desalter 21, gland steam condenser 22, low pressure feed-water heater 23, degasser 24, high service heater 25 and economizer 26.As the vapour system of boiler, it is provided with steam-water separator 30, superheater 31, turbine 32 and reheating Device 33.As turbine 32, high-pressure turbine, middle pressure turbine and low-pressure turbine also can be set.
It is applied in the thermal power generation system 1 of boiler feed system by oxygen processing, generates the water-cooling wall of direct current cooker 10 The phenomenon that metal temperature of pipe rises, so that the leakage of the boiler water supply generated by water screen tube breakage becomes problem.Water cooling The reason of metal temperature of wall pipe rises is, dissolves out iron from the piping of low pressure feed-water heater drainage system 27 or water system And generate iron rust (Fe2O3), iron rust adheres to and is piled up in water screen tube inner surface and leads to thermally conductive variation.
In order to prevent above-mentioned water screen tube leakage unfavorable condition, regularly implement water screen tube chemical cleaning, The skin that removal is made of ferrous oxides such as the iron rust that is piled up in pipe internal surface.In previous chemical cleaning, in economizer 26 The circulation path is set between~steam-water separator 30, by making the acid cleaning solution (hydrochloric acid etc.) for being heated to 60~80 DEG C or so exist Circulation in the circulation path, to implement the cleaning on the inside of water screen tube (referring for example to patent document 1).
Patent document 2 discloses the method for sludge that removal generates in atomic pile steam generator etc..Patent document 3 It discloses for from the made of metal cleaning filter used in thermal power generation complete equipment or nuclear power generation complete set of equipments etc. and going Except the method for iron scale.In the method for patent document 3, by only making the facies posterior hepatis being attached in the ferriferous oxide of filter The dissolved ferric iron divided, remove it ferriferous oxide skin from filter removing.
Citation
Patent document
Patent document 1: Japanese Unexamined Patent Publication 8-105602 bulletin
Patent document 2: Japanese Unexamined Patent Application Publication 2004-535546 bulletin
Patent document 3: Japanese Unexamined Patent Publication 2013-71111 bulletin
Summary of the invention
Subject to be solved by the invention
In chemical cleaning previous as described in Patent Document 1, needed in set the circulation path full of cleaning solution.Separately Outside, hydrogen is generated in cleaning due to using acid cleaning solution, chemical cleaning can not be with machinery, the electricity using fire Construction concurrently carries out operation.In this way, the equipment for being not only impregnated in cleaning solution can not be tieed up during implementing chemical cleaning Operation is protected, other equipment can not also carry out upkeep operation, thus in the presence of can not efficiently carry out maintenance such problems.
In previous chemical cleaning method, in order to remove the skin being made of ferrous oxide, need to make cleaning solution with compared with Fast flow rate.In addition, needing to be piped connection, but the upstream side of direct current cooker 10 with major diameter to obtain enough flows Piping and downstream side line are path piping, improper when being attached to chemically-cleaning device.Therefore, specifically, As shown in Patent Document 1 like that, it can only connect and follow in the piping in the upstream side line and steam-water separator 30 of economizer 26 Loop, there are the restrictions on device.
Iron rust is slightly solubility oxide, for previous acid cleaning solution (such as hydrochloric acid system or citric acid system), It is difficult to dissolve in cleaning solution, sludge is generated by chemical cleaning.
In addition, piping, the made of metal filter of patent document 3 surface on be formed with magnet as autoxidation skin Ore bed.It in the method for patent document 3, dissolves the ferriferous oxide skin of attachment all, and only comes magnetite layer dissolution Remove skin.Therefore, if using method disclosed Patent Document 3, sludge can be generated.
The piping shape of the water screen tube of direct current cooker 10 in thermal power generation system 1 etc. is long and complicated, therefore, works as generation When sludge, the case where being piled up in a part of the midway of piping there are sludge and interior blocking will be piped.
Therefore, it needs to remove sludge from cleaning solution in previous chemical cleaning.As removal sludge method, exist as Lower method: cleaning solution by the midway of part filter is set the method that captures the sludge to swim in cleaning solution；? A part of piping of cleaning object equipment etc. is cut off after chemical cleaning and is checked inside pipe, and the physical methods such as attraction cleaning are utilized The method etc. for again welding piping after removal sludge.
In addition, in the previous chemical cleaning for having used acid cleaning solution, need as described above to cleaning solution into Row heating needs that the heating device for heating cleaning solution is in addition arranged.In addition, after cleaning must be acid clear to being impregnated in It is neutralized in the equipment of washing lotion, needs largely to neutralize water.
Thermal power generation system as shown in figure 20 is such, exists in the downstream side of steam-water separator 30 with stainless steel In the case where the superheater 31 of component, when the cleaning solution of the acidity such as stainless steel and hydrochloric acid contacts, it is possible to occur rotten Erosion.Therefore, it in previous chemical cleaning, needs in the no clean system adjacent with the downstream side for the equipment for becoming cleaning object Interior bath is simultaneously pressurizeed, to prevent the intrusion of cleaning solution, to be provided with the pump of bath, pressurization.
In this way, in the case where carrying out previous chemical cleaning, in addition to need a large amount of cleaning solution and bath to use and in With water except, it is also necessary to large-scale equipment and its setting construction, due to long in time limit, bring maintenance cost is high to ask Topic.
The present invention has been made in view of the above-described circumstances, it is intended that providing a kind of chemical cleaning side for removing removing rust Method and chemically-cleaning device for implementing the chemical cleaning method.
Solution for solving the problem
First scheme of the invention is a kind of chemical cleaning method, and the chemical cleaning method has following process: cleaning Liquid supply step, in the cleaning solution supplying process, to the cleaning object equipment supply cleaning with the component for being attached with iron rust Liquid, the cleaning solution include rust remover, and the rust remover is chelating agent, reducing agent or the chelating agent and the reducing agent Mixture；And cleaning process impregnates the region for being at least attached with the iron rust in the component in the cleaning process In the cleaning solution, the oxidation-reduction potential of the cleaning solution, which is maintained, dissolves out the iron rust in the cleaning solution Value, to remove the iron rust from the component, the chelating agent is amino acid system chelating agent, hydroxy acid system chelating agent and organic Any one of phosphorus system chelating agent, the reducing agent be metal ion, sulphite, oxalic acid, formic acid, ascorbic acid, pyrogallol, Any one of hydrazine, hydrogen, the pH of the cleaning solution is in the range of 4~8.
Alternative plan of the invention is a kind of chemically-cleaning device, is used for the clear of the component for being attached with iron rust skin Wash object-based device and carry out chemical cleaning, the chemically-cleaning device has: spray tank, receiving pH are clear in the range of 4~8 Washing lotion, the cleaning solution include rust remover, and the rust remover is chelating agent, reducing agent or the chelating agent and the reducing agent Mixture, the chelating agent is any one of amino acid system chelating agent, hydroxy acid system chelating agent and organic phosphorus chelating agent, The reducing agent is any one of metal ion, sulphite, oxalic acid, formic acid, ascorbic acid, pyrogallol, hydrazine, hydrogen；Medical fluid Supply pipeline links the cleaning object equipment and the spray tank, and supplies the cleaning solution to the component；Pump, It is set to the medical fluid supply pipeline；Medical fluid discharge pipe links the cleaning object equipment and the spray tank, and The cleaning solution is discharged from the component；It is impregnated in the region for being at least attached with the iron rust in the component described clear The mechanism of washing lotion；And being maintained the oxidation-reduction potential of the cleaning solution in cleaning makes the iron rust in the cleaning solution The mechanism of the value of middle dissolution, the spray tank, the medical fluid supply pipeline and the pump are described clear to component supply The mechanism of washing lotion.
In the chemical cleaning method and chemically-cleaning device of above scheme, due to only clear to the conveying of cleaning object equipment Washing lotion, therefore, cleaning fluid volume needed for capable of substantially cutting down chemical cleaning.
Further, since using the cleaning solution comprising rust remover, therefore, even if configuring tool in the downstream side of cleaning object equipment In the case where the equipment for having stainless steel, without the bath etc. implemented for preventing the corrosion of component, without the need for punching The equipment of water, simplifies apparatus structure.In addition, due to cleaning when do not generate hydrogen, can with use fire mechanical execution Or chemical cleaning is concurrently implemented in electricity construction, and inspection, the upkeep operation that can concurrently implement each section therefore can Shorten the maintenance duration.
In this way, if can substantially cut down installation cost, medicine using chemical cleaning method and chemically-cleaning device of the invention Cost needed for the maintenance that product take etc., therefore be advantageous.
In above-mentioned chemical cleaning method, it is maintained under silver-silver chloride electrode benchmark in described value as -0.8V or more And -0.4V or less range in the state of implement the cleaning process.
In above-mentioned chemical cleaning method, it can also be adjusted by supplying reducing atmosphere gas to the cleaning object equipment Whole described value.
Above-mentioned chemically-cleaning device has reducing atmosphere adjustment section, and the reducing atmosphere adjustment section is by the cleaning in cleaning The oxidation-reduction potential of liquid is adjusted under silver-silver chloride electrode benchmark as in -0.8V or more and the range of -0.4V or less Value.
In above-mentioned chemically-cleaning device, the reducing atmosphere adjustment section can also supply also to the cleaning object equipment Former atmosphere gas.
Reducing condition is maintained and as above-mentioned oxidation-reduction potential, so that iron rust is dissolved in cleaning solution and gone It removes.The solids such as sludge hardly are generated because of cleaning, even if in addition, also can in the case where generating a little solid It is enough that easily solid is discharged together with cleaning solution from cleaning object equipment.In addition, the equipment due to not needing removal sludge, Therefore, installation cost can be cut down.
In above-mentioned chemical cleaning method, preferably, the temperature of the cleaning solution in the cleaning process is in the structure In the range more than environment temperature on the periphery of part and below 10 DEG C of temperature higher than the environment temperature.
In above-mentioned chemically-cleaning device, preferably, the temperature to the cleaning solution of the component is supplied in the structure In the range more than environment temperature on the periphery of part and below 10 DEG C of temperature higher than the environment temperature.
Preferably, above-mentioned chemically-cleaning device is also equipped with circulation loop, and the circulation loop is across the pump and by upstream side The medical fluid supply pipeline and the medical fluid supply pipeline in downstream side link up, passed through the cleaning solution of the pump A part the upstream side of the pump is transported to via the circulation loop.
According to the present invention, compared with the case where using acid cleaning solution, removing rust can be removed with low temperature, without energetically Cleaning solution is set to heat up, it is very easy for being maintained the temperature of environment temperature.
If so that cleaning solution is warming up to high 10 DEG C of the temperature than environment temperature hereinafter, if can also further increase cleaning force. Such as easily cleaning solution can be made to heat up using heat generated when pumping operating.There is no energetically cold for structure of the invention But, therefore, for a long time the temperature of cleaning solution can be maintained higher than environment temperature.
According to the present invention, it compared with the existing method for using acidic cleaning solution, can be cleaned with low temperature, result It is that can cut down installation cost and cleaning cost.
In above-mentioned chemical cleaning method, in the state that the cleaning solution is stood, region is impregnated in the cleaning solution In.
Above-mentioned chemically-cleaning device stops supplying the cleaning solution to the component and arrange from the component in cleaning The cleaning solution out, and stand the cleaning solution.
According to above-mentioned chemical cleaning method and chemically-cleaning device, the large-scale the circulation path etc. of no setting is required cleaning solution, energy It is enough to implement to clean with simple process, thus be advantageous.
In above-mentioned chemical cleaning method, also supplied comprising water between the cleaning solution conveying operation and the cleaning process To process, by the cleaning solution supplying of specified amount to the cleaning object equipment in the cleaning solution supplying process, in institute It states in water supply step and supplies the water of specified amount to the cleaning object equipment, so that the region is impregnated in the cleaning In liquid.
Above-mentioned chemically-cleaning device is also equipped with water supply unit, which has: accommodating the water tank of water；By the water tank With the water supplying pipe line of cleaning object equipment connection；And it is set to the jet water pump of the water supplying pipe line.
According to this chemical cleaning method and chemically-cleaning device, can make in cleaning object equipment the layer of cleaning solution with The layer of water becomes isolated state.If the region for being attached with iron rust is made to be impregnated in cleaning solution, other parts are made to be impregnated in water, then The amount of the cleaning solution for chemical cleaning can substantially be cut down.
In above-mentioned chemical cleaning method, or, the cleaning solution is contained in and is made of water soluble polymer In capsule, the capsule is supplied to the cleaning object equipment.
In above-mentioned chemically-cleaning device, or, the cleaning solution is contained in and is made of water soluble polymer In capsule, the spray tank accommodates the capsule, and the capsule is supplied from the cleaning fluid tank to the cleaning object equipment.
According to this chemical cleaning method and chemically-cleaning device, such as easily especially iron rust can be generated more Region be impregnated in cleaning solution, therefore, can substantially cut down used in cleaning solution amount.
In above-mentioned chemical cleaning method, it is repeated in the cleaning process and arranges the cleaning solution from the component Process out and the process that the cleaning solution after discharge is delivered to the component, thus make the liquid level of the cleaning solution Height moves near the region.
In above-mentioned chemically-cleaning device, following steps are repeated in cleaning: keeping the cleaning solution in the component logical The medical fluid discharge pipe is crossed to be discharged towards the spray tank；And the cleaning solution in the spray tank is made to pass through the medicine Liquid supply pipeline is delivered to the component.
According to this chemical cleaning method and chemically-cleaning device, flow velocity is assigned to cleaning solution in the region for being attached with iron rust And cleaning solution is stirred, so cleaning force improves, therefore is advantageous.
In above-mentioned chemical cleaning method, in the cleaning process, the cleaning solution is by the component from described The upstream side end of component is discharged, and the cleaning solution ejected is directly recycled to the end of downstream side of the component.
There are circulation portions in above-mentioned chemically-cleaning device, which has: by the upstream side end of the component with The pipeloop of end of downstream side connection；And it is set to the circulating pump of the pipeloop, in cleaning, pass through the circulation Pipeline recycles the cleaning solution being discharged from the end of downstream side to the upstream side end.
According to this chemical cleaning method and chemically-cleaning device, also assigns and flowing to cleaning solution in the region for being attached with iron rust Speed and stir cleaning solution, therefore, cleaning force improve.In addition, cleaning solution is heated when passing through pump, thus than Implement cleaning in the state that the environment temperature on the periphery of component is high, therefore, cleaning force improves.
The chemical cleaning method according to involved in first scheme also has following process: measurement process, in the measurement process In, measure the concentration of iron in the cleaning solution；And judgment step is based on the concentration of iron, in the judgment step to judge The removal situation that the iron rust is removed from the component, in the cleaning process, by the cleaning solution from the cleaning object Equipment discharge, in the measurement process, measures the concentration of iron in the cleaning solution ejected, sentences in the judgment step The variable quantity for breaking in the case where being normal concentration or more for the concentration of iron or being judged as concentration gradient is in prescribed limit In the case where value, terminate the cleaning process.
In the chemically-cleaning device involved in alternative plan, it is also equipped with judging part, by the cleaning object equipment The oxidation-reduction potential of the cleaning solution be maintained the value for dissolving out the iron rust in the cleaning solution and to the cleaning pair During being cleaned as equipment, the judging part is based on dense from the iron in the cleaning solution that the cleaning object equipment is discharged Degree is being judged as that the concentration of iron is normal concentration or more to judge to dissolve out the removal situation of the iron rust from the component In the case of or be judged as concentration gradient variable quantity be prescribed limit in value in the case where, terminate the cleaning object and set Standby cleaning.
In the case where being unevenly attached with iron rust in component, during component is impregnated in cleaning solution, cleaning solution In concentration of iron generate distribution.In terms of the construction of cleaning object equipment, in order to measure concentration of iron and only from the attachment in component It is very difficult that the areas adjacent of iron rust, which chooses cleaning solution,.
In this regard, in the chemical cleaning method and chemically-cleaning device of above scheme, in cleaning, using from cleaning pair The concentration of iron in cleaning solution being temporarily discharged as equipment judges the end of chemical cleaning.In this way, not only it is easy measurement iron Concentration, and cleaning solution is stirred and cleaning solution is discharged from cleaning object equipment, so that concentration of iron becomes uniformly, Therefore measurement precision improves.In accordance with the invention it is possible to reliably make a return journey removing rust by chemical cleaning, efficiency can be maintained Improve such effect.
In above-mentioned chemical cleaning method, or, it, will be described with the defined time cycle in the cleaning process Cleaning solution is discharged from the cleaning object equipment, is judged as that the concentration of iron is less than the feelings of normal concentration in the judgment step Under condition or be judged as concentration gradient variable quantity be greater than the value in prescribed limit in the case where, return to the cleaning solution The cleaning object equipment.
In above-mentioned chemically-cleaning device, or, the judging part use is discharged simultaneously from the cleaning object equipment The concentration of iron in the cleaning solution of the spray tank is stored in judge the removal situation of the iron rust.
According to above scheme, can be implemented by simple process and apparatus structure cleaning object equipment cleaning, The stirring of cleaning solution.
In the chemical cleaning method involved in first scheme, or, in the cleaning process, the cleaning solution It is discharged by the component from one end side end of the component, the cleaning solution ejected is directly to the another of the component One end end circulation is measured described in the measurement process using a part of the cleaning solution ejected Concentration of iron.
There are circulation portions, which has: by the component in the chemically-cleaning device involved in alternative plan The pipeloop that one end side end and another side end directly link；And it is set to the circulating pump of the pipeloop, In cleaning, by the pipeloop, make the cleaning solution being discharged from one end side end to the another side end Circulation, is provided with extraction unit on the pipeloop, and the judging part uses the cleaning solution chosen from the extraction unit In the concentration of iron judge the removal situation of the iron rust.
In this chemical cleaning method and chemically-cleaning device, flow velocity is assigned to cleaning solution in the region for being attached with iron rust And stir cleaning solution, therefore, cleaning force improves.In addition, a part of the cleaning solution of circulation also can be used in chemistry The end of cleaning judges.
In the chemical cleaning method involved in first scheme of the invention, also include in the cleaning process to attachment The observation process for thering is the color in the face of the iron rust to be observed；And judge to remove institute from the component based on the color The judgment step for stating the removal situation of iron rust, the face for being attached with the iron rust are the regions or are impregnated in the cleaning solution The part for being attached with the iron rust in test body, is judged as in the judgment step and does not observe the face from the iron rust In the case where color, terminate the cleaning process.
It is also equipped with judging part in the chemically-cleaning device involved in alternative plan of the invention, by the cleaning object The oxidation-reduction potential of the cleaning solution of equipment is maintained the value for dissolving out the iron rust in the cleaning solution and to described During cleaning object equipment is cleaned, the judging part is being attached with the iron rust to the iron rust using the observation of color Face on the removal situation that dissolves out judged, be judged as do not observe from the color of the iron rust in the case where, terminate The cleaning of the cleaning object equipment, the face for being attached with the iron rust is the region or the test for being impregnated in the cleaning solution The part for being attached with the iron rust in body.
In the chemical cleaning method and chemically-cleaning device of this programme, also can substantially it cut down needed for chemical cleaning Cleaning fluid volume, and can shorten and safeguard therefore the duration can be realized the substantially reduction of maintenance cost.
In addition, according to this programme, can simple method as the surplus by the iron rust for determining whether attachment sentence The end of disconnected chemical cleaning, therefore play and improve effect as operating efficiency.
In the chemical cleaning method involved in first scheme of the invention, also include in the cleaning process in institute It states and implements ultrasonic metering or alternating current characteristics measurement on the face of the side opposite with the side for being formed with the region of component Measurement process；And judge to remove from the component based on the time change of the measured value obtained in the measurement process The judgment step of the removal situation of the iron rust is judged as that the measured value is specified value feelings below in the judgment step Under condition or in the case where being judged as that the variable quantity of the variable gradient of the measured value is value in prescribed limit, terminate described clear Wash process.
Be also equipped in the chemically-cleaning device involved in alternative plan of the invention: measurement unit is arranged in the structure On the face of the side opposite with the face for being formed with the iron rust of part, and implement ultrasonic metering or exchange relative to the component Electrical characteristics measurement；And judging part, make the oxidation-reduction potential of the cleaning solution of the cleaning object equipment to be maintained Value that the iron rust dissolves out in the cleaning solution and during cleaned to the cleaning object equipment, which is based on The time change for the measured value that the measurement unit is got judges the removal situation for removing the iron rust from the component, is sentencing Breaking as the measured value is in specified value situation below or to be judged as that the variable quantity of the variable gradient of the measured value is In the case where value in prescribed limit, terminate the cleaning of the cleaning object equipment.
In above-mentioned chemical cleaning method and above-mentioned chemically-cleaning device, preferably, the measured value is by described What ultrasonic metering obtained is attached to the thickness of the iron rust of the component.
Alternatively, preferably, the measured value is to pass through in above-mentioned chemical cleaning method and above-mentioned chemically-cleaning device The reactance that the alternating current characteristics measure.
In the chemical cleaning method and chemically-cleaning device of this programme, also can substantially it cut down needed for chemical cleaning Cleaning fluid volume, and can shorten and safeguard therefore the duration can be realized the substantially reduction of maintenance cost.
In addition, in the present solution, being conceived to by implementing ultrasonic metering from the face of the side opposite with iron rust attachment surface Or alternating current characteristics measurement and the attachment of measured value and iron rust that gets accordingly change.This programme has such as Lower advantage: without choosing cleaning solution, and simple method as the surplus of the iron rust by determining whether attachment, it can be rapid Ground judges the end of chemical cleaning.
In the chemical cleaning method involved in first scheme of the invention, following work is carried out in the cleaning process Sequence: measurement process, in the measurement process, being repeated makes the iron the oxidation-reduction potential of the cleaning solution to be maintained In the state of the value dissolved out in the cleaning solution of becoming rusty from the component be discharged the process of the cleaning solution with by the cleaning solution The process that is conveyed to the component of at least part, move the height of the liquid level of the cleaning solution near the region The iron rust is removed from the component in the state of dynamic, and is measured in the process of the discharge from described in component discharge The pressure of cleaning solution；And judgment step, in the judgment step, based on the pressure obtained in the measurement process Variation, to judge to remove the removal situation of the iron rust from the component, in the process of the conveying, by the cleaning solution with The mode of defined frequency shift conveying capacity is delivered to the component, in the judgment step, is being judged as the cleaning solution Conveying capacity variation waveform and the pressure variation waveform phase difference be specified value situation below under or In the case where being judged as the variable quantity of the variable gradient of the phase difference for the value in prescribed limit or it is being judged as the pressure The period of the waveform of the variation of power or amplitude are in specified value situation below or in the variable gradient for being judged as the period Variable quantity or the amplitude variable gradient variable quantity be prescribed limit in value in the case where, terminate the scavenger Sequence.
It is also included in the chemically-cleaning device involved in alternative plan of the invention and is set to the medical fluid supply pipeline Valve；It is set to the pressure measurement unit of the medical fluid discharge pipe；And judging part, will be described in the cleaning object equipment The oxidation-reduction potential of cleaning solution is maintained the value for dissolving out the iron rust in the cleaning solution and sets to the cleaning object During being cleaned, following steps are repeated: at least part of the cleaning solution in the component being made to pass through the medicine Liquid discharge pipe is discharged towards the spray tank and the cleaning solution in the spray tank is made to pass through the medical fluid supply pipe Line is delivered to the component, and the pump or the valve make the conveying capacity of the cleaning solution conveyed to the component with defined frequency Rate variation, the pressure measurement unit circulate during cleaning the cleaning object equipment in the medical fluid discharge pipe The pressure of the cleaning solution measured, the judging part judges to remove institute from the component based on the variation of the pressure State the removal situation of iron rust, waveform and the pressure of the judging part in the variation for the conveying capacity for being judged as the cleaning solution The phase difference of the waveform of variation be specified value situation below under or the variable gradient for being judged as the phase difference variation In the case that amount is value in prescribed limit or the variation for being judged as the pressure waveform period or amplitude be regulation It is worth the change of the variable gradient in situation below or in the variable quantity or the amplitude that are judged as the variable gradient in the period In the case that change amount is the value in prescribed limit, terminate the cleaning of the cleaning object equipment.
Chemical cleaning method and chemically-cleaning device according to involved in above scheme, are repeated in cleaning process The discharge of cleaning solution makes liquid level mobile with conveying, thus assigns flow velocity to cleaning solution in the region for being attached with iron rust and makes clear Washing lotion is stirred, so cleaning force improves, therefore is advantageous.
According to the attachment state of iron rust, the coefficient of friction of cleaning solution and component changes.The inventors discovered that cleaning When changing conveying capacity with defined frequency, in component, the liquid level of cleaning solution vibrates, the vibration state Reflect the pressure change of cleaning solution when discharge.As this programme, phase difference or pressure based on frequency and pressure change The waveform of variation can easily judge the removal of iron rust.
Invention effect
According to the present invention, compared with previous chemical cleaning method, the usage amount of cleaning solution can be cut down, and is simplified The apparatus structure of chemically-cleaning device, therefore, cost needed for capable of substantially cutting down chemical cleaning.
In addition, in the present invention, not conveying cleaning solution to other equipment, hydrogen is not generated in cleaning, it therefore, can be with change It learns cleaning and simultaneously carries out other operations.Therefore, the present invention plays advantageous as the shortening maintenance duration compared with prior art Effect.
In addition, in the present invention, monitoring the removal situation of iron rust using the parameter of measurement in cleaning process to sentence Therefore the opportunity that disconnected cleaning process terminates reliably can remove removing rust from component surface.
Detailed description of the invention
Fig. 1 is the synoptic diagram for illustrating chemically-cleaning device involved in first embodiment.
Fig. 2 is the synoptic diagram of an example of direct current cooker.
Fig. 3 is the synoptic diagram of an example of direct current cooker.
Fig. 4 is the synoptic diagram for illustrating the chemical cleaning method of first embodiment.
Fig. 5 is the SEM photograph of the water screen tube section before cleaning solution dipping.
Fig. 6 is the SEM photograph of the water screen tube section after chemical cleaning.
Fig. 7 is the synoptic diagram of the test film used in the end judgement of the cleaning process based on color change.
Fig. 8 is the figure for illustrating the end judgment method of the cleaning process based on color change.
Fig. 9 is carried out to the chemically-cleaning device of the end judgment method for implementing the cleaning process based on color change The synoptic diagram of explanation.
Figure 10 is the figure for illustrating the measuring method of alternating current characteristics.
Figure 11 is the circuit diagram of alternating current characteristics measurement shown in Fig. 10.
Figure 12 is the synoptic diagram for illustrating chemically-cleaning device involved in second embodiment.
Figure 13 is the synoptic diagram for illustrating chemically-cleaning device involved in third embodiment.
Figure 14 is the synoptic diagram for illustrating chemically-cleaning device involved in the 4th embodiment.
Figure 15 is the synoptic diagram for illustrating chemically-cleaning device involved in the 5th embodiment.
Figure 16 is said to the chemically-cleaning device of the end judgement for implementing the cleaning process based on pressure change Bright synoptic diagram.
Figure 17 is the figure for illustrating the end judgement of the cleaning process based on pressure change.
Figure 18 is the synoptic diagram for illustrating chemically-cleaning device involved in the 8th embodiment.
Figure 19 is the synoptic diagram for illustrating chemically-cleaning device involved in the 9th embodiment.
Figure 20 is the synoptic diagram of thermal power generation system.
Specific embodiment
The cleaning solution used in chemical cleaning method and chemical cleaning system of the invention is comprising neutral derusting The aqueous solution of agent.
Neutral rust remover is the intermixture of chelating agent, reducing agent or chelating agent and reducing agent.Chelating agent is, for example, EDTA、BAPTA、DOTA、EDDS、INN、NTA、DTPA、HEDTA、TTHA、PDTA、DPTA-OH、HIDA、DHEG、GEDTA、 The hydroxy acids such as the amino acid system chelating agent of the amino acid such as CMGA, EDDS or these salt etc., citric acid, gluconic acid, hydroxyacetic acid or this The organic phosphorus of the organic phosphoric acids such as the hydroxy acid system chelating agent of a little salt etc., ATMP, HEDP, NTMP, PBTC, EDTMP or these salt etc. Chelating agent.Reducing agent is, for example, Fe2+、Sn2+Etc. the sulphite such as each metal ion species, sodium sulfite, oxalic acid, formic acid, Vitamin C The organic compounds such as acid, pyrogallol, hydrazine, hydrogen etc..The pH of cleaning solution comprising neutral rust remover be 4~8, pH be preferably 5~ 7。
Preservative can also be added in neutral rust remover.In order to obtain desired cleaning force and scavenging period, The concentration of chelating agent, reducing agent and preservative in cleaning solution is suitably adjusted.
In addition, cleaning solution also may include the defoaming agent for preventing foaming, defoaming agent can also not included.In this implementation In mode, well known defoaming agent can be used.
Below.To the embodiment party of chemical cleaning method and chemically-cleaning device of the invention by taking thermal power generation system as an example Formula is illustrated.But the invention is not limited to thermal power generation system, other that can also apply to be attached with iron rust are set It is standby.
[first embodiment]
Fig. 1 is the synoptic diagram for illustrating chemically-cleaning device involved in first embodiment.Fig. 1 is shown in maintenance Shi Huo The case where chemically-cleaning device 100 are provided in force generating system 1.The structure of thermal power generation system 1 is identical as Figure 20.In firepower In electricity generation system 1, the iron rust as powdery skin is attached with inside the heat transfers such as the water screen tube of direct current cooker 10 piping and makes to pass The thermal conductivity of heat piping reduces.Therefore, in order to restore heating conduction, direct current cooker 10 becomes cleaning object equipment.
The chemically-cleaning device 100 of first embodiment includes spray tank 101；Spray tank 101 and direct current cooker 10 are connected The medical fluid supply pipeline 102 of knot；The medical fluid discharge pipe 103 that spray tank 101 and direct current cooker 10 are linked；And control unit 104.Spray tank 101 accommodates above-mentioned cleaning solution.Control unit 104 is, for example, computer.Control unit 104 includes judging part.
Fig. 2 is an example of direct current cooker.Fig. 2 (a) is the synoptic diagram of direct current cooker, and Fig. 2 (b) is in Fig. 2 (a) by circle A The enlarged drawing of the part of encirclement.The direct current cooker 10a of Fig. 2 (a) is by the combustion chamber 11a and multiple water-cooling walls that are surrounded by wall surface 12a Pipe is constituted.The linear pipe of the water screen tube 13a of direct current cooker 10a is along wall surface 12a vertical with the combustion chamber cross section 11a Side upwardly extend.Multiple water screen tube 13a are arranged in the horizontal direction along wall surface 12a.The lower part setting of 11a in combustion chamber There is lower tube aggregation portion 14a, the lower end of multiple water screen tube 13a is connect with lower tube aggregation portion 14a.The 11a in combustion chamber Top is provided with upper tube aggregation portion, and the upper end of multiple water screen tube 13a is connect with upper tube aggregation portion 15a.
Fig. 3 is another example of direct current cooker.Fig. 3 (a) is the synoptic diagram of direct current cooker, and Fig. 3 (b) is in Fig. 3 (a) by circle The enlarged drawing for the part that B is surrounded.The shape of the water screen tube of the direct current cooker 10b of Fig. 3 and the direct current cooker 10a of Fig. 2 are different.? In direct current cooker 10b, the downside of 11b in combustion chamber, multiple water screen tube 13b are spirally arranged along wall surface 12b.It is firing At the vertical direction half-way (branch portion 16) for burning room 11b, water screen tube 13b branches into multiple pipes.Water-cooling wall after branch Pipe 13b is linearly, and extends upward on the direction vertical with the combustion chamber cross section 11a along wall surface 12b.
In combustion chamber, the lower part of 11b is provided with lower tube aggregation portion 14b, the lower end and lower part of multiple water screen tube 13b Pipe aggregation portion 14b connection.In combustion chamber, the top of 11b is provided with upper tube aggregation portion, the upper end of multiple water screen tube 13b with Upper tube aggregation portion 15b connection.
In the chemically-cleaning device 100 of first embodiment, in the lower tube aggregation portion of direct current cooker 10 (10a, 10b) Medical fluid supply pipeline 102 and medical fluid discharge pipe 103 are connected on 14a, 14b.
105 and valve V1 of pump is provided on medical fluid supply pipeline 102.Valve V2 is provided on medical fluid discharge pipe 103. Pump 105, valve V1, V2 and control unit 104 connect.
According to the difference of the arrangement method of water screen tube, position accompanying by iron rust is different.Iron rust has in water screen tube It is inside easy to be attached to the trend at the changed position of flow velocity of boiler water supply.For example, in the direct current cooker 10a of Fig. 2, iron rust Adhere to more than other positions in the water screen tube 13a inner surface being located at below the 11a of combustion chamber.In the direct current cooker 10b of Fig. 3 In, iron rust adheres to more than other positions in the water screen tube 13b inner surface of branch portion 16.
The chemically-cleaning device 100 of first embodiment is also equipped with reducing atmosphere adjustment section.In the change of first embodiment It learns in cleaning device 100, reducing atmosphere adjustment section is reducing atmosphere gas supply part 110.Reducing atmosphere gas supply in Fig. 1 Portion 110 has reducing atmosphere gas reservoir 111 and gas supply line 112.Chemically-cleaning device 100 has exhaust line 113.? Gas supply line 112 and exhaust line 113 are respectively arranged with valve V3, V4.Gas supply line 112 and exhaust line 113 and direct current Upper tube aggregation portion 15a, 15b of boiler 10 (10a, 10b) are connected.Valve V3, V4 and control unit 104 connect.
Reducing atmosphere gas reservoir 111 is the cylinder for accommodating reducing atmosphere gas.Reducing atmosphere gas is for will be clear Washing lotion is adjusted to the gas of reducing condition.Specifically, reducing atmosphere gas is nitrogen, argon, steam, carbon dioxide, burning waste gas Deng.The purity of reducing atmosphere gas is not necessarily high-pure gas, as long as can be by the oxygen of the cleaning solution in aftermentioned cleaning process Change reduction potential to be maintained in prescribed limit.In the case where using nitrogen as reducing atmosphere gas, as reducing atmosphere Gas supply part 110 can utilize the nitrogen injection device both set in thermal power generation system 1, and nitrogen injection can also temporarily be arranged Equipment or new setting nitrogen injection device.It can be set as the steam of reducing atmosphere gas, burning waste gas in adjacent another fire The steam that is generated in the boiler of force generating system, burning waste gas.
Hereinafter, to using the chemically-cleaning device 100 of first embodiment to clean the iron rust being attached in direct current cooker The chemical cleaning method of removal is illustrated.
The chemical cleaning method of present embodiment is setting up furnace inner support for example in thermal power generation system when inspecting periodically Process, during the process constructed to the equipment other than cleaning object equipment (direct current cooker 10) in implement.
When implementing the chemical cleaning method of present embodiment, set in the piping of connection direct current cooker 10 and economizer 26 The valve set is closed.
<gas supply step>
Control unit 104 is open by valve V2, V3.Reducing atmosphere gas (nitrogen etc.) is passed through from reducing atmosphere gas reservoir 111 Water screen tube 13a, 13b of direct current cooker 10 are transported to by gas supply line 112.Air in water screen tube 13a, 13b via Medical fluid discharge pipe 103 is discharged to exterior.By the process, the sky in water screen tube 13a, 13b in direct current cooker 10 Gas is discharged via medical fluid discharge pipe 103.By gas supply step, atmosphere gas is reduced in water screen tube 13a, 13b Filling.
After the displacement of gas have passed through time enough, control unit 104 closes valve V2, V3.
<cleaning solution supplying process>
Control unit 104 makes pump 105 start and open valve V1.Control unit 104 is open by valve V4.In spray tank 101 Cleaning solution is transported to direct current cooker 10 via medical fluid supply pipeline 102.Water screen tube 13a, 13b inner surface is immersed in as a result, In cleaning solution, the purge gas in water screen tubes 13a, the 13b such as nitrogen of the comparable volume of cleaning solution come with supply is via exhaust Pipeline 113 is discharged to exterior.
In the present embodiment, since connection direct current cooker 10 and the valve of the piping of economizer 26 are closed, from medicine Liquid supply pipeline 102, which is supplied to the cleaning solution of lower tube aggregation portion 14a, 14b, may not flow into economizer 26.
In the present embodiment, the region for being attached with iron rust of at least water screen tube 13a, 13b inner surface is immersed in cleaning In liquid.The region that iron rust is largely attached with compared with other positions of especially water screen tube 13a, 13b inner surface must impregnate In cleaning solution.For example, as shown in figure 4, control unit 104 so that cleaning solution liquid level 18 be located at compared with other positions iron rust it is attached The mode of the top in more region 17 supplies cleaning solution.If considering the cost of chemical cleaning, cleaning solution is with multiple water The upper end (interconnecting piece connecting with upper tube aggregation portion 15a, 15b) of cold wall pipe 13a, 13b are filled for the upper limit.In this reality It applies in mode, cleaning solution does not reach the steam-water separator 30 in downstream side more than direct current cooker 10.That is, in the present embodiment, Cleaning solution is supplied only by the direct current cooker 10 as cleaning object equipment.
The region of iron rust, the region that especially iron rust adheres to more compared with other positions are attached with by predefining 17 position can determine the need that can impregnate the cleaning solution of iron rust adhering zone according to each size of water screen tube 13a, 13b It measures.Control unit 104 stores the requirement of cleaning solution, will specified amount corresponding with steam requirement in cleaning solution supplying process Cleaning solution be delivered to direct current cooker 10.
<cleaning process>
When the region for being attached with iron rust is immersed in cleaning solution, control unit 104 stops pump 105 and by valve V1, V4 It closes.In the state that cleaning solution is stood, iron rust is soaked in cleaning solution and implements cleaning process.
Soaking time (scavenging period) also depends on the yield of iron rust, for example, 24 hours or more.In the cleaning process In, the pressure in water screen tube 13a, 13b hardly changes and keeps constant.
In the present embodiment, due in cleaning process cleaning solution be allowed to stand for, the cleaning solution temperature in cleaning process Degree becomes degree identical with the environment temperature on the periphery of water screen tube 13a, 13b.For example, the periphery of water screen tube 13a, 13b Environment temperature be 20~40 DEG C or so.It will not occur since environment temperature is close to extraneous gas temperature, and in cleaning process Biggish variation, therefore, cleaning solution temperature are also maintained the degree almost the same with environment temperature.
Due to being filled with reducing atmosphere gas to the space inside water screen tube 13a, 13b by gas supply step, because This, the cleaning solution in cleaning process is maintained reducing condition.Specifically, for example in the midway of medical fluid discharge pipe 103, it can The oxidation-reduction potential of the cleaning solution in cleaning process is measured using oxidation-reduction potentiometer, which is maintained It is -0.8V or more and -0.4V or less under silver-silver chloride electrode benchmark.According to pH- current potential line chart, by the way that redox is electric Position is set as -0.4V hereinafter, the dissolution reaction efficiency to ferriferous oxide improves, and iron rust dissolves in cleaning solution.On the other hand, oxygen It is lower to change reduction potential, more generation Fe0.When oxidation-reduction potential is less than -0.8V, Fe is generated0, thus sludge settling or iron It is attached to water screen tube 13a, 13b.
In the case where oxidation-reduction potential is detached from prescribed limit, reducing atmosphere gas is refilled, to maintain to clean The oxidation-reduction potential of liquid.Specifically, valve V2, V3 is open.As a result, from reducing atmosphere gas reservoir 111 to direct current pot Furnace 10 supplies reducing atmosphere gas, and cleaning solution is delivered to spray tank 101 via medical fluid discharge pipe 103.Then, by valve V2, V3 It closes, valve V1, V4 is open, and priming pump 105, the cleaning solution in spray tank 101 is delivered to direct current cooker 10 as a result,.Or Person, it is in the state of closing valve V1, V2 that valve V3, V4 is open, thus from reducing atmosphere gas reservoir 111 to direct current cooker 10 supply reducing atmosphere gases, refill reducing atmosphere gas.
In the case where oxidation-reduction potential is detached from specified value, above-mentioned reducing agent can also be added in cleaning solution.Tool For body, as described above, after making cleaning solution add reducing agent back to spray tank 101 and in spray tank 101, Cleaning solution is delivered to direct current cooker 10.
The maintenance of oxidation-reduction potential can be based on the instruction from the control unit 104 being monitored to oxidation-reduction potential And realize automation, it can also be by operator by implementing the detection and maintenance of oxidation-reduction potential manually.
Fig. 5,6 are that the effect of the chemical cleaning method of present embodiment is demonstrated on the water screen tube chosen from physical device The result of fruit.The water screen tube for being attached with iron rust is chosen from physical device, and (leaching is dipped into the state of being maintained 25 DEG C Bubble) Yu Shangshu cleaning solution (pH5~7) in.The ingredient of cleaning solution is chelating agent is 3~5 weight %, reducing agent is 1.5~2.5 Condition appropriate is selected between weight %.
Water screen tube inner surface before cleaning solution dipping is red, in SEM photograph (Fig. 5), confirms autoxidation skin (magnetic iron ore (Fe3O4)) and iron rust.On the other hand, the water screen tube inner surface after chemical cleaning is black, at SEM photograph (Fig. 6) In, only confirm autoxidation skin.
The cleaning effect of cleaning solution is demonstrated using iron rust.The cleaning solution (pH5~7) for being added to iron rust powder is put into appearance Device carries out the top of cleaning solution to carry out liquid sealing after nitrogen purging.Oxidation-reduction potential in during test is in silver-chlorine Change under silver electrode benchmark as in the range of -0.8V~-0.4V.The ingredient of cleaning solution is 3~5 weight %, reducing agent in chelating agent Condition appropriate is selected between 1.5~2.5 weight %.Cleaning solution is stood 8 hours in the state of remaining 25 DEG C, is tied Fruit is that cleaning solution is nearly transparent from opaque reddish brown color change.This indicates that, by impregnating, iron rust dissolves in cleaning solution.
In the present embodiment, based on the concentration of iron in (1) cleaning solution, the color change of (2) iron rust attachment portion, (3) Any of analysis result of internal state is analyzed on the outside of from water screen tube to judge the end of cleaning process.
(1) judgement based on the concentration of iron in cleaning solution
It is with the defined time cycle that valve V2, V3 is open in cleaning process.Reducing atmosphere gas is from reducing atmosphere gas Reservoir 111 is delivered to water screen tube 13a, 13b of direct current cooker 10 via gas supply line 112, in water screen tube 13a, 13b Cleaning solution is delivered to spray tank 101 via medical fluid discharge pipe 103 from lower tube aggregation portion 14a, 14b.When all cleaning solutions are received When being dissolved in spray tank 101, valve V2, V3 are closed.
<measurement process>
Choose a part for the cleaning solution being recovered in spray tank 101.Using the cleaning solution of selection, and by by JIS Quantitative analysis as defined in B8224 measures the concentration of iron in cleaning solution.The concentration of iron quilt got within the defined time cycle It is input to the judging part of control unit 104.
<judgment step>
The numerical value of concentration of iron in cleaning solution increase with time, when iron rust is completely removed from water screen tube 13a, 13b, Concentration is saturated to approximately constant value.Judging part judges the situation that iron rust dissolves out and is removed according to the time change of concentration of iron.
By basic test or simulation, it is contemplated that indicating the concentration of iron that the iron rust of attachment is fully dissolved out.It is tried by basis Or the obtained concentration of iron of simulation can also be used as and indicate normal concentration (judging benchmark concentration) that iron rust is removed and be stored in Judging part.In this case, judging part is being judged as that the concentration of iron measured by measurement process judging benchmark concentration or more In the case of, it is believed that iron rust is dissolved out and is removed, and judging part makes control unit 104 terminate cleaning process, implements aftermentioned discharge process.
Alternatively, can also judge the removal of iron rust according to the variable quantity of concentration of iron.In the case where iron rust is fully dissolved out, The variation (concentration gradient) per unit time of the difference of the measured value and last time measured value of the concentration of iron measured by measurement process It gradually becomes smaller.Accordingly, the variable quantity of concentration gradient is stored in judging part as benchmark is judged, judging part is being judged as concentration In the case that the variable quantity of gradient becomes the value within prescribed limit, it is believed that iron rust is dissolved out and is removed, and judging part makes control unit 104 terminate cleaning process, implement aftermentioned discharge process.
For example, measuring time T in measurement processtThe concentration of iron C at placetAnd it is inputted to judging part.Judging part is also stored with Secondary (time Tt-1) concentration of iron Ct-1With last time (time Tt-2) concentration of iron Ct-2。
Judging part acquisition time TtWith time Tt-1Between concentration of iron concentration gradient Δ C per unit timet(=(Ct- Ct-1)/(Tt-Tt-1)).Judging part is stored with the concentration gradient Δ C per unit time for the concentration of iron that last time getst-1(= (Ct-1-Ct-2)/(Tt-1-Tt-2))。
Judging part obtains the concentration gradient Δ C this time gottThe concentration gradient Δ C got with last timet-1Variable quantity Δdt.Judging part is in the Δ d gottIn the case where in the range of pre-stored judgement benchmark, it is judged as and reaches judgement base It is quasi-.For example, judging benchmark for ± 20%.In the case that the precipitation of iron rust in cleaning object equipment 10 is relatively uniform, it will sentence Disconnected benchmark is set as ± 10%, and thus, it is possible to improve judgement precision.
In the case where being judged as the concentration of iron for being newly entered measurement unit less than benchmark is judged, or it is being judged as concentration In the case that the variable quantity of gradient is greater than prescribed limit, judging part makes control unit 104 continue to implement cleaning process.Control unit 104 By process same as cleaning solution supplying process, the cleaning solution in spray tank 101 is again fed to direct current cooker 10.
In the present embodiment, in above-mentioned measurement process, the measurement with concentration of iron simultaneously measures the oxidation of cleaning solution Reduction potential can also be by spray tank in the case where the oxidation-reduction potential of cleaning solution is detached from above-mentioned prescribed limit Cleaning solution in 101 puts into reducing agent to carry out the composition adjustment of cleaning solution.
(2) based on the judgement of color change
In this judgment method, any of test film, (B) water screen tube of iron rust is attached with by observation (A) Color change is judged.
(2-A) uses the judgement of test film
Prepare the test film for being attached with iron rust.
As shown in fig. 7, test film is axially to be cut to two-part water screen tube, iron is attached on inner wall Rust.Direct current cooker 10 (cleaning object equipment) same degree that the test film (cutting test film 120) is attached with and is cleaned Iron rust.For example, by pervious maintenance from same position choose water screen tube, from use under similar conditions other at The water screen tube alternatively taken is arranged to cut off to make test film.
Test film is also possible to the plate (plate test film) with water screen tube for same material, and attached on a surface Have the iron rust with water screen tube same degree.
In addition, the water screen tube that test film is also possible to choose as described above (is the test film of tubular, and not as above-mentioned Cutting test film is axially cut off like that).
In this judgement, in cleaning process, the face for being attached with iron rust of test film is impregnated in cleaning solution.
Multiple cutting test films or plate test film are immersed in storage while cleaning beginning as dipping method In the cleaning solution of spray tank 101.
In such a situation it is preferred that being configured to 101 delivered inside reducing atmosphere gas of spray tank, in immersion test piece During, the cleaning solution inside spray tank 101 is adjusted to oxidation-reduction potential identical with water screen tube 13a, 13b.
As another dipping method, as shown in Figure 8, to by configuring transparent panel (example in the section of cutting test film 120 Such as acrylic acid system) 121 and in the space 122 that the end face configuration plate (in Fig. 8 not shown) of cutting test film 120 is formed Middle injection includes the cleaning solution with the rust remover for the cleaning solution same concentrations for being delivered to direct current cooker 10, thus will be attached with iron rust Face be impregnated in cleaning solution.The injection of cleaning solution is preferably substantially simultaneously carried out with the beginning of cleaning process.
In such a situation it is preferred that being that, using reducing atmosphere gas, the cleaning solution in cutting test film 120 will be injected into Oxidation-reduction potential is adjusted to oxidation-reduction potential identical with water screen tube 13a, 13b.
As another dipping method, as shown in Figure 9, by-pass portion is set in the upstream side valve V1 of medical fluid supply pipeline 102 130, tubular test film 132 is connected in the position halfway of the bypass pipe 131 of by-pass portion 130.It is risen in cleaning solution supplying process When moving pump 105 and opening valve V1, flowed by a part of the cleaning solution of medical fluid supply pipeline 102 to by-pass portion 130, from And it is impregnated in the inner wall of tubular test film 132 in cleaning solution.
In such a situation it is preferred that be, in gas supply step, reducing atmosphere gas is also to reach the side of by-pass portion 130 Formula is supplied to, and the cleaning solution in tubular test film 132 of the tubular test film 132 during impregnated is adjusted to and water screen tube The identical oxidation-reduction potential of 13a, 13b.
<observation process>
In cleaning process, is taken out from the cleaning solution in spray tank 101 with predetermined time interval and be impregnated in cleaning solution In one of test film.The color in the face for being attached with iron rust for the test film that observation station takes out.By the visual of operator or It is observed using CCD camera.In the case where visual observation, judgement knot of the operator to judging part input color change Fruit.In the case where the observation based on CCD camera, measurement data are sent to judging part.
As shown in Figure 8, in the case where the face for being attached with iron rust is impregnated in cleaning solution, with the defined time cycle from transparent Implement based on visual or CCD camera observation 121 side of plate.
In the case where being provided with by-pass portion 130 as shown in Figure 9, cylinder is observed using CCD camera with the defined time cycle The inner wall of shape test film 132.Specifically, wearing peep hole on tubular test film 132, can make to come to peep hole insertion Viewport as CCD camera is injected from the reflected light at observation position, so that observation is impregnated in the inner wall of cleaning solution.Measure data It is sent to judging part.
<judgment step>
Iron rust is substantially red, the but natural oxidizing layer (magnetic iron ore: substantially when carrying out the removal of iron rust, as substrate Black) or substrate metal layer (substantially silver color) exposing, therefore tone changes.
Judging part is judged as that iron rust has been removed in the case where not observing the color from iron rust.Judging part makes to control Portion 104 processed terminates cleaning process, implements aftermentioned discharge process.Judging part in the case where observing the color from iron rust, Control unit 104 is set to continue to implement cleaning process.
Judging part separates the RGB ingredient for measuring data-signal, only pulls out R component or extraction R component and B component.Judgement Portion judges iron rust according to the time change of the time change of R component or the ratio between R component and B component (R component/B component) The situation of dissolution and removal.
Specifically, judging part store R component value relative to the ratio between initial value (R component measured value/R component initial value), Or R component/B component value is relative to the ratio between initial value ((R component/B component measured value)/(R component/B component initial value)) Judgement benchmark.Specifically, the judgement benchmark is the value in the range of 1/5~1/10.According to the precipitation state of iron rust, R at Divide or R component/B component measured value is different, it is therefore preferable that determination judges benchmark in basic test.
Judging part exists relative to the ratio between initial value or R component/B component value relative to the ratio between initial value in R component value Judge to be judged as in benchmark situation below and do not observe the color from iron rust.Judging part is not being observed from iron rust In the case where color, it is believed that iron rust has been dissolved out and has been removed, and so that control unit 104 is terminated cleaning process, is implemented aftermentioned discharge work Sequence.
It is greater than judgement relative to the ratio between initial value relative to the ratio between initial value or R component/B component value in R component value In the case where benchmark, remain iron rust, therefore judging part makes control unit 104 continue to implement cleaning process.
(2-B) uses the judgement of water screen tube
It is with the defined time cycle that valve V2, V3 is open in cleaning process.Reducing atmosphere gas is from reducing atmosphere gas Reservoir 111 is delivered to water screen tube 13a, 13b of direct current cooker 10 via gas supply line 112, in water screen tube 13a, 13b Cleaning solution is delivered to spray tank 101 via medical fluid discharge pipe 103 from lower tube aggregation portion 14a, 14b.When all cleaning solutions are received When being dissolved in spray tank 101, valve V2, V3 are closed.
<observation process>
Peep hole is worn near the region 17 for being attached with iron rust of water screen tube 13a, 13b.Peep hole is formed in water On the face of the side opposite with combustion chamber 11a, 11b of cold wall pipe 13a, 13b.Come to the viewport of peep hole insertion CCD camera Observe inner wall.
<judgment step>
By process same as the explanation in (2-A), judging part judges the removal of iron rust according to the color from iron rust Situation makes control unit 104 continue to implement cleaning process or terminate cleaning process.
It should be noted that for being formed on the face of water screen tube 13a, 13b to use CCD camera to be judged Peep hole fill by welding etc. after chemical cleaning terminates and make its recovery.
(3) judgement based on the analysis result of analysis internal state on the outside of water screen tube
In the method, it is measured by wall thickness based on ultrasound or alternating current characteristics measurement is to analyze in water screen tube The state in portion.
(3-A) ultrasonic metering
Before implementing chemical cleaning, ultrasonic probe is installed on the outside of the water screen tube in the region for being attached with iron rust.Attachment There is the region of iron rust to pass through the selection water screen tube in the maintenance of last time and observes inner wall to determine.Alternatively, by implementing Before chemical cleaning, the lateral edge water flow outside water screen tube that makes to pop one's head in leads to direction and is scanned and measures the water screen tube for being attached with iron rust Wall thickness determine.
<measurement process>
In cleaning process, implement the ultrasonic metering of water screen tube with predetermined time interval.It is obtained in measurement process The measured value (thickness of water screen tube) got is sent to judging part.
<judgment step>
When iron rust is dissolved out and is removed, measured value is reduced, when iron rust is removed completely, measurement based on ultrasound It is worth the wall thickness as the water screen tube of unattached iron rust and becomes constant.Judging part is according to time of measured value based on ultrasound Change the removal situation to judge iron rust.
By basic test or simulation, it is contemplated that indicating the wall thickness for the water screen tube that the iron rust of attachment is fully dissolved out.It is logical It crosses basic test or simulates obtained wall thickness and be stored in judging part as the judgement benchmark for indicating that iron rust has been removed.In the situation Under, judging part is in the case where being judged as that the wall thickness measured by measurement process becomes and judges benchmark situation below, it is believed that iron rust is solubilized It is removed out, judging part makes control unit 104 terminate cleaning process, implements aftermentioned discharge process.
Alternatively, can also judge the removal of iron rust according to the variable quantity of the measured value of wall thickness.It is fully dissolved out in iron rust In the case of, the difference of the wall thickness value obtained in measurement process and the wall thickness value obtained in the measurement process of last time gradually becomes smaller. Accordingly, the gradient of the variation of wall thickness per unit time, that is, wall thickness change gradient variable quantity is deposited as benchmark is judged It is stored in judging part, judging part is recognized in the case where the variable quantity for being judged as wall thickness change gradient becomes the value within prescribed limit For iron rust has dissolved out and is removed, judging part makes control unit 104 terminate cleaning process, implements aftermentioned discharge process.
Specific judgement utilizes thought identical with the method illustrated in the judgement of (1) based on the concentration of iron in cleaning solution Come carry out.In the case where ultrasonic metering, judge that benchmark is also ± 20%.In addition, the iron rust in cleaning object equipment 10 Precipitation it is relatively uniform in the case where, will judge that benchmark is set as ± 10%, thus, it is possible to improve judgement precision.
In the case where being judged as that the wall thickness value measured by measurement process not up to judges benchmark or it is being judged as wall In the case that the variable quantity of thick variable gradient is greater than prescribed limit, judging part makes control unit 104 continue to implement cleaning process.
The measurement of (3-B) alternating current characteristics
As shown in Figure 10, before implementing chemical cleaning, it is special that electricity is set on the outside of the water screen tube in the region for being attached with iron rust Property evaluating apparatus 140.Two butt 141 are separately positioned in the axial direction of water screen tube 13 (13a, 13b), set between terminal 141 It is equipped with LCR tester 142.Distance between 141 front end of terminal is set as 1m~5m or so, to be easy and water screen tube 13 The D.C. resistance amount of (13a, 13b) is distinguished.Also it can replace LCR tester 142 and Network Analyzer be set.
<measurement process>
In cleaning process, implement the alternating current characteristics measurement of water screen tube with predetermined time interval.
Figure 11 is the circuit diagram in the case where being provided with electrical characteristics evaluating apparatus 140 as shown in Figure 10.Water screen tube 13 and water screen tube inside cleaning solution be expressed as resistance R1 and R3.Be attached with the region 17 of iron rust by resistance R2a, R2b and capacitance C1, C2 are indicated.
Iron rust (oxide) is resistance components.When carrying out the removal of iron rust, the capacitance (C1 and C2) of iron rust subtracts Few, therefore, the reactance of foregoing circuit is reduced.LCR tester 142 is with the reactance of predetermined time interval measurement water screen tube 13. The value of the reactance got in measurement process is sent to judging part.
<judgment step>
When carrying out the removal of iron rust, the measured value of reactance is reduced, when iron rust is removed completely, the reactance that measures at It is constant.Judging part judges the removal situation of iron rust dissolution according to the time change of reactance.
By basic test or simulation, it is contemplated that indicating the reactance for the water screen tube that the iron rust of attachment has been fully dissolved out. Judging part is stored in as the judgement benchmark for indicating that iron rust has been removed by the reactance that basic test or simulation obtain.At this In the case of, judging part is in the case where being judged as that the reactance measured by measurement process becomes and judges benchmark situation below, it is believed that iron rust It has dissolved out and has been removed, judging part makes control unit 104 terminate cleaning process, implements aftermentioned discharge process.
Alternatively, can also judge the removal of iron rust according to the variable quantity of the measured value of reactance.It is fully dissolved out in iron rust In the case of, the difference of the reactance obtained in measurement process and the reactance obtained in the measurement process of last time is gradually reduced.Every list The variable quantity of the reactance change gradient of position time is stored in judging part as benchmark is judged, judging part is being judged as reactance change In the case that the variable quantity of gradient becomes the value in prescribed limit, it is believed that iron rust has been dissolved out and has been removed, and judging part makes control unit 104 terminate cleaning process, implement aftermentioned discharge process.
Specific judgement utilizes thought identical with the method illustrated in the judgement of (1) based on the concentration of iron in cleaning solution Come carry out.In the case where measuring alternating current characteristics, judge that benchmark is also ± 20%.In addition, in cleaning object equipment 10 In the case that the precipitation of iron rust is relatively uniform, it will judge that benchmark is set as ± 10%, thus, it is possible to improve judgement precision.
In the case where being judged as that the reactance measured by measurement process not up to judges benchmark, or it is being judged as reactance In the case that the variable quantity of variable gradient is greater than prescribed limit, judging part makes control unit 104 continue to implement cleaning process.
<discharge process>
Control unit 104 is open by valve V2.Cleaning solution in water screen tube 13a, 13b is passed through from lower tube aggregation portion 14a, 14b Spray tank 101 is delivered to by medical fluid discharge pipe 103 and is recovered.The chemical cleaning method of present embodiment terminates as a result,.
If the cleaning solution being recovered to remains rust remover, after cleaning ingredient (concentration of rust remover) can also be readjusted It is used further to chemical cleaning next time.
According to the above method, due to using the cleaning solution comprising neutral rust remover, even if real in the state of immersion Cleaning process is applied, the inner surface for being impregnated in water screen tube 13a, 13b of cleaning solution will not corrode, and iron rust can be made to be dissolved in In cleaning solution.
It is not the magnetite layer made as autoxidation skin in the present embodiment as using Fig. 5,6 explanations It dissolves out and removes the method for removing removing rust, therefore, it is suppressed that the generation of sludge.Especially in thermal power generation system 1, direct current pot The piping shape of the water screen tube of furnace 10 is long and complicated, therefore, when generating sludge, sometimes sludge be deposited in piping midway and It will be blocked in piping.As in the present embodiment, if iron rust is made to be dissolved in cleaning solution and go it from water screen tube 13a, 13b It removes, then after chemical cleaning, the iron rust of dissolution can be discharged together with the discharge of cleaning solution.Thus, for example using this In the thermal power generation system 1 of embodiment, the equipment for not needing the removal sludge such as filter is not needed for removing sludge yet The process of other cleanings etc..
[second embodiment]
Figure 12 is the synoptic diagram for illustrating chemically-cleaning device involved in second embodiment.
It is identical with first embodiment, in the chemically-cleaning device 200 of second embodiment, under direct current cooker 10 14a, 14b are connected with medical fluid supply pipeline 202 and medical fluid discharge pipe 203 to pipe aggregation portion, portion.Medical fluid supply pipeline 202 and Medical fluid discharge pipe 203 is connect with spray tank 201.Exhaust line is connected in upper tube aggregation portion 15a, 15b of direct current cooker 213。
Chemically-cleaning device 200 has reducing atmosphere gas supply part in the downstream side of the pump 205 of medical fluid supply pipeline 202 210 as reducing atmosphere adjustment section.Reducing atmosphere gas supply part 210 is connect with control unit 204.
The reducing atmosphere gas supply part 210 of second embodiment is micro bubble generating device.Micro bubble generating device is to liquid The device of bubble is injected in body.In the present embodiment, the gas injected as bubble to liquid (cleaning solution) is real first Apply the reducing atmosphere gas enumerated in mode.
In Figure 12, although not shown, but the reducing atmosphere gas connecting with direct current cooker 10 can also be set in the same manner as Fig. 1 Body reservoir and gas supply line.
Hereinafter, chemical cleaning method of the explanation using the chemically-cleaning device 200 of second embodiment.In present embodiment In, when implementing chemical cleaning method, also the valve being arranged in the piping of connection direct current cooker 10 and economizer 26 is closed.
<cleaning solution supplying process, gas supply step>
Control unit 204 closes valve V2.204 priming pump 205 of control unit and reducing atmosphere gas supply part 210 and general Valve V1 is open.Cleaning solution in spray tank 201 is transported to reducing atmosphere gas supply part 210 via medical fluid supply pipeline 202. Reducing atmosphere gas supply part 210 injects the bubble of reducing atmosphere gas into cleaning solution.Cleaning solution comprising bubble is via medicine Liquid supply pipeline 202 and supply to direct current cooker 10 water screen tube 13a, 13b.
Bubble in cleaning solution releases from cleaning solution in water screen tube 13a, 13b and is stored in supply to water screen tube The upper space of cleaning solution in 13a, 13b.Control unit 204 is open by valve V4, make air in water screen tube 13a, 13b via Exhaust line 213 is discharged into exterior.In this way, being replaced into also Primordial Qi from purge gas atmosphere in water screen tube 13a, 13b Atmosphere gas.
In this way, in this second embodiment, not needing independent gas supply step as in the first embodiment, water The displacement of gas in cold wall pipe 13a, 13b carries out together with cleaning solution supplying process.
<cleaning process>
When the region (especially iron rust adheres to obtain region 17 more than other positions) for being at least attached with iron rust be impregnated in it is clear When washing lotion, control unit 204 stops pump 205 and reducing atmosphere gas supply part 210 and closes valve V1, V4.In cleaning solution In the state of standing, implement the soaking and washing processing of iron rust.In the present embodiment, the cleaning solution in water screen tube 13a, 13b It also is same degree with the environment temperature on the periphery of water screen tube 13a, 13b, oxidation-reduction potential is maintained in silver-silver chloride electricity It is -0.8V or more and -0.4V or less under the benchmark of pole.
In the present embodiment, same as first embodiment, based on the concentration of iron in (1) cleaning solution, the attachment of (2) iron rust Partial color change, (3) any of analysis result of analysis internal state on the outside of water screen tube judge scavenger The end of sequence.When judging part is judged as that iron rust has dissolved out and when being removed in judgment step, judging part terminates control unit 204 Cleaning process implements discharge process.
<discharge process>
By process same as first embodiment, the cleaning solution in water screen tube 13a, 13b is recovered to spray tank 201.The chemical cleaning method of present embodiment terminates as a result,.
First and second embodiment chemical cleaning method in used the feelings of the cleaning solution without containing defoaming agent Under condition, so that cleaning solution is foamed and cleaning solution is delivered to water screen tube 13a, 13b, be attached in the region for producing iron rust The cleaning solution of blister.Increased by the time that iron rust is contacted with the cleaning solution of blister, so that cleaning force improves.In addition, passing through Cleaning solution is set to become blister, so that the usage amount of cleaning solution is reduced.
[third embodiment]
Figure 13 is the synoptic diagram for illustrating chemically-cleaning device involved in third embodiment.
It is same as first embodiment, in the chemically-cleaning device 300 of third embodiment, the lower part of direct current cooker 10 14a, 14b are connected with medical fluid supply pipeline 302 and medical fluid discharge pipe 303 in pipe aggregation portion.Medical fluid supply pipeline 302 and medicine Liquid discharge pipe 303 is connect with spray tank 301.
As reducing atmosphere adjustment section, chemically-cleaning device 300 has reducing atmosphere regulator supply unit 310.Also Primordial Qi Atmosphere regulator supply unit 310 has reducing atmosphere regulator reservoir 311 and reducing atmosphere regulator supply pipeline 312.Also Former Atmosphere control reservoir 311 accommodates reducing atmosphere regulator.Reducing atmosphere regulator is, for example, hydrazine, L-AA, sulphur Huang system reducing agent etc..
Reducing atmosphere regulator supply unit 310 is connect in the downstream side of pump 305 with medical fluid supply pipeline 302.In also Primordial Qi Valve V5 is provided on atmosphere regulator supply pipeline 312.Valve V5 is connect with control unit 304.
In Figure 13, although not shown, but the reducing atmosphere gas connecting with direct current cooker 10 can also be set in the same manner as Fig. 1 Body reservoir, gas supply line and exhaust line.
Hereinafter, to using the chemically-cleaning device 300 of third embodiment to clean the iron rust being attached in direct current cooker The chemical cleaning method of removal is illustrated.It, will be in connection direct current cooker when implementing the chemical cleaning method of present embodiment 10 close with the valve being arranged in the piping of economizer 26.
<cleaning solution supplying process>
Control unit 304 closes valve V2.304 priming pump 305 of control unit and valve V1, V5 is open.In spray tank 301 Cleaning solution by the way that reduction is put into cleaning solution from reducing atmosphere regulator supply unit 310 during medical fluid supply pipeline 302 Atmosphere control.Put into water screen tube 13a, the 13b for thering is the cleaning solution of reducing atmosphere regulator to be transported to direct current cooker 10.
<cleaning process>
When the region for being at least attached with iron rust is impregnated in cleaning solution, control unit 304 make pump 305 stop and by valve V1, V5 is closed.In the state that cleaning solution is stood, implement the soaking and washing processing of iron rust.
In the present embodiment, the also ring with the periphery of water screen tube 13a, 13b of the cleaning solution in water screen tube 13a, 13b Border temperature is same degree.By putting into reducing atmosphere regulator from reducing atmosphere regulator supply unit 310 to cleaning solution, thus The oxidation-reduction potential of cleaning solution is maintained under silver-silver chloride electrode benchmark as -0.8V or more and -0.4V or less.Control Portion 304 obtains the reducing atmosphere regulator input amount of steam oxidation reduction potential in order to obtain and adjusts the aperture of valve V5.
In the present embodiment, same as first embodiment, based on the concentration of iron in (1) cleaning solution, the attachment of (2) iron rust Partial color change, (3) any of analysis result of analysis internal state on the outside of water screen tube judge scavenger The end of sequence.When judging part is judged as that iron rust has dissolved out and when being removed in judgment step, judging part terminates control unit 304 Cleaning process implements discharge process.
<discharge process>
By process same as first embodiment, the cleaning solution in water screen tube 13a, 13b is discharged via medical fluid Pipeline 303 is recovered in spray tank 301.The chemical cleaning method of present embodiment terminates as a result,.
In the case where being largely attached with iron rust, the variation of oxidation-reduction potential increases because of caused by the dissolution of iron rust. It as in the present embodiment, can be easily by oxidation-reduction potential by cleaning solution additional input reducing atmosphere regulator It is adjusted in the range of -0.8~-0.4V.
[the 4th embodiment]
Figure 14 is the synoptic diagram for illustrating chemically-cleaning device involved in the 4th embodiment.
It is same as the chemically-cleaning device of first embodiment, chemically-cleaning device 400 involved in the 4th embodiment Have spray tank 401, medical fluid supply pipeline 402, medical fluid discharge pipe 403, control unit 404, pump 405, as reducing atmosphere gas The reducing atmosphere gas reservoir 411 and gas supply line 412 of body supply unit 410, exhaust line 413.
In chemically-cleaning device 400, across medical fluid supply pipeline 402 pump 405 and be provided with circulation loop 406.
It should be noted that can also be arranged for the chemically-cleaning device of second embodiment and third embodiment Circulation loop.
In cleaning solution supplying process, cleaning solution is risen by 405 temperature of pump.The one of the cleaning solution of pump 405 is passed through Part flows into circulation loop 406, and the medical fluid for being delivered to 405 upstream sides of pump shares pipeline.In this way, in direct current cooker 10 Conveying has the cleaning solution after heating in water screen tube 13a, 13b, with high temperature compared with first embodiment to third embodiment (specifically, the environment temperature on the periphery higher than water screen tube 13a, 13b, and environment temperature is+10 DEG C or less) implement cleaning Process.
Improve the temperature of cleaning process, more promotion cleaning solution and iron rust react and iron rust is molten into cleaning solution Solution.According to the present embodiment, do not have to setting heating device, can realize the heating of cleaning solution in simple structure.In addition, due to Environment temperature and the temperature difference of cleaning solution temperature are small, therefore, can be for a long time by cleaning solution in the structure of present embodiment Temperature be maintained the temperature higher than environment temperature.As a result, cleaning force can be further increased.
In the present embodiment, method same as first embodiment is utilized also to judge the end of cleaning process.
[the 5th embodiment]
Figure 15 is the synoptic diagram for illustrating chemically-cleaning device involved in the 5th embodiment.
It is same as the chemically-cleaning device of first embodiment, chemically-cleaning device 500 involved in the 5th embodiment Have spray tank 501, medical fluid supply pipeline 502, medical fluid discharge pipe 503, control unit 504, pump 505, as reducing atmosphere gas The reducing atmosphere gas reservoir 511 and gas supply line 512 of body supply unit 510, exhaust line 513.
Chemically-cleaning device 500 is configured to be also equipped with water supply unit 520.Water supply unit 520 has water tank 521 and water supplies To pipeline 522.Water tank 521 takes in water in inside.Jet water pump 523 and valve V6 are provided on water supplying pipe line 522.Water supply Pipeline 522 is connect with lower tube aggregation portion 14a, 14b.
Hereinafter, to using the chemically-cleaning device 500 of the 5th embodiment to clean the iron rust being attached in direct current cooker The chemical cleaning method of removal is illustrated.It, will be in connection direct current cooker when implementing the chemical cleaning method of present embodiment 10 close with the valve being arranged in the piping of economizer 26.
<gas supply step>
By process same as first embodiment, from reducing atmosphere gas reservoir 511 via gas supply line 512 to Reducing atmosphere gas is supplied in water screen tube 13a, 13b, and atmosphere gas filling is reduced in water screen tube 13a, 13b.
<cleaning solution supplying process>
Control unit 504 makes pump 505 start and open valve V1, V4.Cleaning solution in spray tank 501 is supplied via medical fluid Pipeline 502 is delivered to direct current cooker 10.
After it delivered the cleaning solution of specified amount, control unit 504 stops pump 505 and closes valve V1.Then, it controls Portion 504 makes jet water pump 523 start and open valve V6.The water in water tank 521 is delivered to directly via water supplying pipe line 522 as a result, Flow water screen tube 13a, 13b of boiler 10.
By adjusting cleaning solution and the flow velocity of water, so that the layer of cleaning solution is on the upside of vertical direction, the layer of water becomes On the downside of vertical direction, in the state that the layer of cleaning solution is separated at least part of the layer of water, in water screen tube 13a, 13b Water level rises.In the present embodiment, control unit 504 is by the cleaning solution of specified amount and water respectively from spray tank 501 and water Case 521 is delivered to water screen tube 13a, 13b so that the iron rust in water screen tube 13a, 13b adhere to more than other positions Region 17 is impregnated in the layer of cleaning solution.
<cleaning process>
When iron rust adhere to region 17 more than other positions be impregnated in cleaning solution when, control unit 504 stops jet water pump 523 Only and by valve V4, V6 close.In the state that cleaning solution is stood, implement the soaking and washing of iron rust.In the present embodiment, it cleans Cleaning solution temperature in process is also same degree with the environment temperature on the periphery of water screen tube 13a, 13b, in cleaning process The oxidation-reduction potential of cleaning solution is maintained -0.8V or more and -0.4V or less (silver-silver chloride electrode benchmark).
In the present embodiment, the state for needing to ensure to have separated the layer of cleaning solution with the layer of water in cleaning process. Therefore, color change, (3) based on (2) the iron rust attachment portion illustrated in the first embodiment are divided on the outside of water screen tube Any of analysis result of internal state is analysed to judge the end of cleaning process.When judging part is judged as in judgment step When iron rust has been dissolved out and has been removed, judging part makes control unit 504 terminate cleaning process, implements discharge process.
<discharge process>
By process same as first embodiment, the cleaning solution in water screen tube 13a, 13b is delivered to spray tank 501.The chemical cleaning method of present embodiment terminates as a result,.
The rust remover concentration for being recovered to the cleaning solution of spray tank 501 reduces.Therefore, it is re-used after additional new cleaning solution Cleaning solution, or cleaning solution is discharged from spray tank 501 and is discarded.
Method according to the present embodiment, due to iron rust adhere to region 17 more than other positions be impregnated in cleaning solution and It is removed by concentrating, therefore, therefore the amount that can substantially cut down used cleaning solution can cut down cleaning cost.
[sixth embodiment]
The chemically-cleaning device of sixth embodiment is and first embodiment other than cleaning solution is contained in microcapsules Identical structure.
Microcapsules are obtained and above-mentioned cleaning solution is packaged in water-soluble capsule.The capsule material of microcapsules is for example It is the water-soluble macromolecule such as dextrin, converted starch, gelatin, gum arabic, sodium alginate, carragheen.The size of microcapsules For example, diameter 0.5mm~2mm or so.Microcapsules are for example made by spray drying process, spray drop warm therapy etc..
It is micro- in the upstream side setting of the pump 105 of medical fluid supply pipeline 102 in the chemically-cleaning device of sixth embodiment Capsule supply unit.Microcapsules supply unit has the case of receiving microcapsules.Microcapsules are being scattered in conveying liquid (such as water) Case is contained under state.
In sixth embodiment, implement in the same manner as first embodiment gas supply step, cleaning solution supplying process, Cleaning process and discharge process.In the cleaning solution supplying process of sixth embodiment, by by microcapsules supply unit with The starting for the pump being arranged in the flow path that medical fluid supply pipeline 102 links, the conveying comprising microcapsules is supplied with liquid in medicine In the cleaning solution to circulate in liquid supply pipeline 102, so that the cleaning solution comprising microcapsules is supplied to water screen tube 13a, 13b. In water screen tube 13a, 13b, microcapsules are moved upward and are deposited near liquid level.The capsule of microcapsules is by being dissolved in Conveying liquid and release cleaning solution, be formed about the layer of the cleaning solution of blister in liquid level.The dispersion of appropriate adjustment microcapsules Concentration (cleaning fluid volume) and liquid level (amount that liquid is used in the conveying that control unit 104 supplies), so that especially iron rust is attached Region 17 more than other positions is impregnated in the layer of cleaning solution.
Method according to the present embodiment, can make iron rust generate region more than other positions is easy is impregnated in cleaning Therefore liquid further can substantially cut down the amount of used cleaning solution, can further cut down cleaning cost.
It should be noted that sixth embodiment can also apply to second embodiment~the 5th embodiment chemistry Cleaning method and chemically-cleaning device.
[the 7th embodiment]
Illustrate chemical cleaning method involved in the 7th embodiment using the chemically-cleaning device 100 of Fig. 1.The 7th In the chemical cleaning method of embodiment, other than cleaning process, implement gas supply work in the same manner as first embodiment Sequence, cleaning solution supplying process and discharge process.
In the cleaning process of the chemical cleaning method of the 7th embodiment, when the region for being attached with iron rust is impregnated in cleaning When liquid, control unit 104 makes pump 105 stop and close valve V1, V4.
Control unit 104 is open by valve V2.By the opening of valve V2, cleaning solution is conveyed via medical fluid discharge pipe 103 To be back to spray tank 101, therefore, the liquid level of the cleaning solution in water screen tube 13a, 13b is reduced.Then, control unit 104 is closed Valve V2 is simultaneously open by valve V1, starts pump 105.The cleaning solution in spray tank 101 is conveyed via medical fluid supply pipeline 102 as a result, To water screen tube 13a, 13b of direct current cooker 10, the liquid level of the cleaning solution in water screen tube 13a, 13b rises.Control unit 104 with The defined period implements the discharge and conveying of the cleaning solution.
The discharge rate of cleaning solution in this can be a part of cleaning solution, be also possible to whole.If changing cleaning solution Discharge rate can then change the variable quantity of liquid level.It is preferred that consider iron rust adhere to the size in region than other positions more than, clean Efficiency etc. and the variable quantity for suitably setting the discharge rate of cleaning solution, i.e. liquid level.Control unit 104 is accordingly arranged with fluid change amount Out and conveying specified amount cleaning solution.
During alternatively, it is also possible to the discharge and conveying periodically alternately implementing to be repeated cleaning solution with the standing phase Between.
When the discharge and conveying of cleaning solution is repeated, cleaned near the liquid level in water screen tube 13a, 13b The stirring of liquid, and flow velocity is assigned to cleaning solution.As a result, cleaning force improves, the cleaning efficiency of iron rust rises.
In the present embodiment, same as first embodiment, based on the concentration of iron in (1) cleaning solution, the attachment of (2) iron rust Partial color change, (3) any of analysis result of analysis internal state on the outside of water screen tube judge scavenger The end of sequence.When judging part is judged as that iron rust has been removed in judgment step, judging part makes control unit 104 terminate scavenger Sequence implements discharge process.
In addition, in the present embodiment, the end of cleaning process can also be judged based on (4) pressure change.
(4) based on the judgement of pressure change
In the judgement based on pressure change signal, as shown in figure 16, it is arranged in the half-way of medical fluid discharge pipe 103 Pressure gauge 150.
When carrying out the conveying operation in above-mentioned cleaning process, the aperture of the revolution or valve V1 that make pump 105 is with defined Frequency increase and decrease.In this way, the conveying capacity of cleaning solution is increased and decreased with defined frequency, and therefore, the liquid level of cleaning solution is in water screen tube It is vibrated in 13a, 13b.
<measurement process>
In the discharge process in above-mentioned cleaning process, pressure gauge 150 is to the cleaning solution for passing through medical fluid discharge pipe 103 Pressure measured.Pressure value is sent to judging part.
<judgment step>
When due to conveying operation and the liquid level of cleaning solution vibrate when, the pressure that is measured by pressure gauge 150 in discharge process It is changed periodically in a manner of the vibration state for reflecting liquid level.The variation of the pressure is changed according to the attachment of iron rust. That is, when by cleaning carry out iron rust removal when, the coefficient of friction of cleaning solution and iron rust changes, thus pressure change through when Ground changes.Pressure when iron rust is removed from water screen tube, in the frequency and discharge process of the cleaning solution conveying in conveying operation The frequency of power variation is consistent.Therefore, the pressure when phase and discharge process of periodic cleaning solution conveying when conveying operation The difference of the phase of variation becomes constant.
Judgment step is implemented according to either one or two of two steps below.
(step 4-A)
As illustrated in Figure 17, judging part obtain conveying operation when conveying capacity waveform and measurement process in obtain The waveform of the variation for the pressure value got.Judging part is compared the waveform of conveying capacity with the waveform of pressure change, judges iron The removal situation of rust dissolution.
Specifically, by basic test or simulation, it is contemplated that defeated in the case that accompanying iron rust is fully dissolved out The difference (phase difference, Figure 17 in illustrated) of the phase of the waveform of the phase and pressure change of the waveform for the amount of sending.Pass through basic test Or the phase difference that simulation obtains is stored in judging part as the judgement benchmark that expression iron rust has been removed.In this case, sentence Disconnected portion is being judged as phase difference measure by measurement process as under judging benchmark situation below, it is believed that iron rust dissolved out and It is removed, judging part makes control unit 104 terminate cleaning process, implements discharge process.
Or the removal of iron rust can also be judged according to the variable quantity of phase difference.In the case where iron rust is fully dissolved out, The difference for the phase difference that obtained phase difference and last time obtains gradually becomes smaller.The gradient of the variation of phase difference per unit time, I.e. the variable quantity of phase difference variable gradient is stored in judging part as benchmark is judged, is judged as phase difference variation ladder in judging part In the case that the variable quantity of degree becomes the value in prescribed limit, judging part makes control unit 104 terminate cleaning process, implements aftermentioned Process is discharged.
Using specific to carry out in (1) thought identical based on the method illustrated in the judgement of the concentration of iron in cleaning solution Judgement.In the case where being judged using phase difference, judge that benchmark is also ± 20%.In addition, in cleaning object equipment 10 In the case that the precipitation of interior iron rust is relatively uniform, it will judge that benchmark is set as ± 10%, thus, it is possible to improve judgement precision.
In the case where being judged as phase difference greater than benchmark is judged, or in the variable quantity for being judged as phase difference variable gradient In the case where prescribed limit, judging part makes control unit 104 continue to implement cleaning process.
(step 4-B)
Judging part obtains the waveform of the variation of the pressure value got in measurement process, according to the period of waveform, amplitude Deng ongoing change judge the removal situation of iron rust.
Specifically, by basic test or simulation, it is contemplated that the pressure in the case that accompanying iron rust is fully dissolved out The period of the waveform of force value, amplitude.The period or amplitude obtained by basic test or simulation has been removed as expression iron rust Judgement benchmark and be stored in judging part.In this case, it is being judged as period or amplitude as the situation for judging benchmark or less Under, it is believed that iron rust has been dissolved out and has been removed, and judging part makes control unit 104 terminate cleaning process, implements discharge process.
Alternatively, can also judge the removal of iron rust according to the variable quantity of period or amplitude.In the feelings that iron rust is fully dissolved out Under condition, by measure the difference of the variable quantity in period or amplitude that process obtains and the variable quantity in period or amplitude that last time obtains by Gradual change is small.The gradient of mechanical periodicity or amplitude variations per unit time, i.e. mechanical periodicity gradient or amplitude variations gradient Variable quantity, which is used as, judges that benchmark is stored in judging part, and judging part is in variable quantity or the amplitude variations ladder for being judged as mechanical periodicity gradient In the case that the variable quantity of degree becomes the value in prescribed limit, it is believed that iron rust has been dissolved out and has been removed, and judging part makes control unit 104 Terminate cleaning process, implements aftermentioned discharge process.
Using specific to carry out in (1) thought identical based on the method illustrated in the judgement of the concentration of iron in cleaning solution Judgement.In the case where service life or amplitude are judged, judge benchmark electricity for ± 20%.In addition, being set in cleaning object In the case that the precipitation of iron rust in standby 10 is relatively uniform, it will judge that benchmark is set as ± 10%, thus, it is possible to improve judgement precision.
In the case where being judged as period or amplitude greater than benchmark is judged, or in the variation for being judged as mechanical periodicity gradient In the case that the variable quantity of amount or amplitude variations gradient is greater than prescribed limit, judging part makes control unit 104 continue to implement scavenger Sequence.
It should be noted that the chemical cleaning method of present embodiment can also apply to using second embodiment~the The case where chemically-cleaning device of four embodiments.
[the 8th embodiment]
Figure 18 is the synoptic diagram for illustrating chemically-cleaning device involved in the 8th embodiment.
It is same as the chemically-cleaning device of first embodiment, chemically-cleaning device 600 involved in the 8th embodiment Have spray tank 601, medical fluid supply pipeline 602, medical fluid discharge pipe 603, control unit 604, pump 605, as reducing atmosphere gas The reducing atmosphere gas reservoir 611 and gas supply line 612 of body supply unit 610, exhaust line 613.Chemically-cleaning device 600 Also has pump 606 on medical fluid discharge pipe 603.On medical fluid discharge pipe 603, it also can be set and pass through medical fluid for measuring The pressure gauge of the pressure of the cleaning solution of discharge pipe 603.
Illustrate chemical cleaning method involved in the 8th embodiment using Figure 18.It is clear in the chemistry of the 8th embodiment In washing method, other than cleaning process, implement gas supply step, cleaning solution supplying process in the same manner as first embodiment And discharge process.
In the cleaning process in the chemical cleaning method of the 8th embodiment, when the region for being attached with iron rust is impregnated in clearly When washing lotion, control unit 604 stops the pump 605 of medical fluid supply pipeline 602 and closes valve V1, V4.
Control unit 604 is open by valve V2, V3 and makes 606 work of pump.By the opening of valve V3, store from reducing atmosphere gas It deposits portion 611 and conveys reducing atmosphere gas, water screen tube from cleaning solution liquid to direct current cooker 10 13a, 13b via gas supply line 612 Gas pressure in the space on face top rises.Meanwhile by the opening of valve V2 and pump 606 starting, by water screen tube 13a, Cleaning solution inside 13b is delivered to spray tank 601 via medical fluid discharge pipe 603, the cleaning solution in water screen tube 13a, 13b Liquid level reduces.
Then, control unit 604 closes valve V2, V3 and opens valve V1, V4.Control unit stops pump 606 and makes pump 605 It starts.The cleaning solution in spray tank 601 is delivered to the water screen tube of direct current cooker 10 via medical fluid supply pipeline 602 as a result, The liquid level of 13a, 13b, the cleaning solution in water screen tube 13a, 13b rise.
Due to utilizing the pressurization of the cleaning solution liquid level based on gas and the discharge of the cleaning solution using pump, with the 7th Embodiment is compared, and flow velocity when cleaning solution is discharged is higher, is easy the stirring and washing near the liquid level in water screen tube 13a, 13b Liquid.Therefore, compared with the 7th embodiment, cleaning force is improved, and the cleaning efficiency of iron rust rises.
In the present embodiment, same as the 7th embodiment, based on the concentration of iron in (1) cleaning solution, the attachment of (2) iron rust Partial color change, (3) the analysis result of analysis internal state, appointing in (4) pressure change signal on the outside of water screen tube One judges the end of cleaning process.When judging part is judged as that iron rust has been removed in judgment step, judging part makes to control Portion 604 terminates cleaning process, implements discharge process.
The chemically-cleaning device and chemical cleaning method of present embodiment can also apply to second embodiment~ In 4th embodiment be set in medical fluid discharge pipe the case where pumping.
[the 9th embodiment]
Figure 19 is the synoptic diagram for illustrating chemically-cleaning device involved in the 9th embodiment.
It is same as the chemically-cleaning device of first embodiment, chemically-cleaning device 700 involved in the 9th embodiment Have spray tank 701, medical fluid supply pipeline 702, medical fluid discharge pipe 703, control unit 704, pump 705, as reducing atmosphere gas The reducing atmosphere gas reservoir 711 and gas supply line 712 of body supply unit 710, exhaust line 713.Chemically-cleaning device 700 It is also equipped with pipeloop 720.
It should be noted that being directed to second embodiment~the 4th embodiment chemically-cleaning device, can also be arranged Same pipeloop.
Pipeloop 720 is connect as the one end of direct current cooker with lower tube aggregation portion 14a, 14b, as direct current cooker Another side connect with upper tube aggregation portion 15a, 15b.The half-way of pipeloop 720 is provided with circulating pump 721.It follows Endless tube line 720 and circulating pump 721 can also be temporarily arranged.
In the downstream side of circulating pump 721, extraction unit 722 is set.
The loop direction of cleaning solution is not particularly limited.In the structure of Figure 19, with cleaning solution in water screen tube 13a, 13b The interior mode to circulate upward under is recycled, but be also configured to by cleaning solution from it is upper circulate downward in a manner of followed Ring.
In the present embodiment, the temperature of cleaning solution is near ambient temperature, also, circular flow is also in cleaning process During at least degree of circulation primary small flow.Therefore, the discharge pressure of circulating pump 721 can also be lower.
Hereinafter, chemical cleaning method of the explanation using the chemically-cleaning device 700 of the 9th embodiment.In the 9th embodiment party In the chemical cleaning method of formula, implement gas supply step and discharge process in the same manner as first embodiment.
<cleaning solution supplying process>
Control unit 704 makes pump 705 start and open valve V1, V4.Cleaning solution in spray tank 701 is via medical fluid supply pipe Line 702 is delivered to direct current cooker 10.In the 9th embodiment, lower tube aggregation portion, water screen tube into direct current cooker 10, Whole supply cleaning solutions of upper tube aggregation portion and pipeloop 720.Control unit 704, which is stored with, can impregnate lower tube aggregation Portion, water screen tube, upper tube aggregation portion and pipeloop 720 whole cleaning fluid volumes, passing through cleaning solution supplying process will The cleaning solution of specified amount is delivered to direct current cooker 10.
Here, the valve being arranged in the piping of connection direct current cooker 10 and steam-water separator 30 is closed.In this way, energy It enough prevents from flowing into cleaning solution in the adjacent equipment in the downstream side of direct current cooker 10, i.e. steam-water separator 30.
<cleaning process>
When the cleaning solution of specified amount is delivered to direct current cooker 10, control unit 704 stops pump 705 and by valve V1, V4 It closes.Then, control unit 704 starts circulating pump 721.Due to the starting of circulating pump 721, cleaning solution assembles portion by lower tube 14a, 14b, water screen tube 13a, 13b, upper tube aggregation portion 15a, 15a and pipeloop 720.That is, in the present embodiment, Will not to the adjacent other equipment (economizer 26, steam-water separator 30) of direct current cooker 10 flow into the state of cleaning solution into Row circulation.Circulation is with cleaning solution middle during cleaning process at least only around 1 week between 10~pipeloop of direct current cooker 720 Flow implement.
It should be noted that the revolution of circulating pump 721 can also be made to be increased and decreased with the defined period.In this way, exist The flow velocity of the cleaning solution of water screen tube 13a, 13b internal circulation changes, and cleaning ability further increases.
In addition, cleaning solution is warmed when through circulating pump 721.Thus, for example being cleaned like that with first embodiment The case where cleaning solution has been stood in process compares, with higher temperature (specifically, being higher than the week of water screen tube 13a, 13b The environment temperature on side, environment temperature are+10 DEG C or less) implement cleaning process.
In cleaning process, logical circulation road (the lower tube aggregation portion 14a, 14b, water screen tube 13a, 13b, top of cleaning solution Pipe aggregation portion 15a, 15b and pipeloop 720) it constitutes and closes space, therefore, the redox electricity of the cleaning solution in cleaning process Position is maintained -0.8V or more and -0.4V or less (silver-silver chloride electrode benchmark).
In the present embodiment, same as first embodiment, based on the concentration of iron in (1) cleaning solution, the attachment of (2) iron rust Any of analysis result, (4) pressure change of partial color change, (3) the analysis internal state on the outside of water screen tube To judge the end of cleaning process.
It, can also as in the first embodiment, in medicine in the case where the judgement of (1) based on the concentration of iron in cleaning solution Recovery and rinsing liquid and concentration of iron is measured in liquid case 701.Alternatively, choosing the cleaning solution for passing through pipeloop 720 from extraction unit 722 A part and be used for determining iron concentration.
In the case where the judgement of (4) based on pressure change, it is arranged in the same manner as the 7th embodiment in pipeloop 720 Pressure gauge.The utilization for increasing and decreasing the revolution of circulating pump 721 with defined frequency is carried out, using by being set to pipeloop 720 The pressure value that pressure gauge measures judges judging part using thought same as the content illustrated in the 7th embodiment The removal situation of iron rust dissolution.
When judging part is judged as that iron rust has been removed in judgment step, judging part makes control unit 704 terminate cleaning process, Implement discharge process.
According to the present embodiment, cleaning solution is enable to stir due to assigning flow velocity to cleaning solution, and in cleaning process Middle cleaning solution is heated, and therefore, compared with the first embodiment of not set pipeloop, cleaning force is improved, the cleaning of iron rust Efficiency rises.
Description of symbols
1 thermal power generation system；
10,10a, 10b direct current cooker；
The combustion chamber 11a, 11b；
12a, 12b wall surface；
13,13a, 13b water screen tube；
14a, 14b lower tube aggregation portion；
15a, 15b upper tube aggregation portion；
16 branch portions；
100,200,300,400,500,600,700 chemically-cleaning device；
101,201,301,401,501,601,701 spray tank；
102,202,302,402,502,602,702 medical fluid supply pipeline；
103,203,303,403,503,603,703 medical fluid discharge pipe；
104,204,304,404,504,604,704 control unit；
105,205,305,405,505,605,606,705 pump；
110,210,410,510,610,710 reducing atmosphere gas supply part；
111,411,511,611,711 reducing atmosphere gas reservoir；
112,412,512,612,712 gas supply line；
113,213,413,513,613,713 exhaust line；
120 cutting test films；
121 transparent panels；
122 spaces；
130 by-pass portions；
131 bypass pipes；
132 tubular test films；
140 electrical characteristics evaluating apparatus；
150 pressure gauges；
310 reducing atmosphere regulator supply units；
311 reducing atmosphere regulator reservoirs；
312 reducing atmosphere regulator supply pipelines；
406 circulation loops；
520 water supply units；
521 water tanks；
522 water supplying pipe lines；
523 jet water pumps；
720 pipeloops；
721 circulating pumps；
722 extraction units.

Claims (18)

1. a kind of chemical cleaning method will be used as cleaning object equipment inside the fiery furnace wall tubes of direct current cooker, have following work Sequence:
Cleaning solution supplying process, in the cleaning solution supplying process, to the cleaning object with the component for being attached with iron rust Equipment supplies cleaning solution, and the cleaning solution includes rust remover, the rust remover be chelating agent, reducing agent or the chelating agent with The mixture of the reducing agent；And
The region for being at least attached with the iron rust in the component is impregnated in described by cleaning process in the cleaning process In cleaning solution, the oxidation-reduction potential of the cleaning solution is maintained to the value for dissolving out the iron rust in the cleaning solution, from And the iron rust is removed from the component,
The chelating agent is any one of amino acid system chelating agent, hydroxy acid system chelating agent and organic phosphorus chelating agent,
The reducing agent is any one of metal ion, sulphite, oxalic acid, formic acid, ascorbic acid, pyrogallol, hydrazine, hydrogen,
The pH of the cleaning solution is in the range of 4~8.
2. chemical cleaning method according to claim 1, wherein
By described value be maintained under silver-silver chloride electrode benchmark in the range of -0.8V or more and -0.4V or less to implement State cleaning process.
3. chemical cleaning method according to claim 1 or 2, wherein
Described value is adjusted by supplying reducing atmosphere gas to the cleaning object equipment.
4. chemical cleaning method according to claim 1 or 2, wherein
The temperature of the cleaning solution in the cleaning process is more than the environment temperature on the periphery of the component and than the ring In range below high 10 DEG C of the temperature of border temperature.
5. chemical cleaning method according to claim 1 or 2, wherein
In the state that the cleaning solution is stood, the region is impregnated in the cleaning solution.
6. chemical cleaning method according to claim 1 or 2, wherein
In the cleaning process, it is repeated process that the cleaning solution is discharged from the component and the institute that will be ejected The process that cleaning solution is delivered to the component is stated, so that the height of the liquid level of the cleaning solution be made to move near the region It is dynamic.
7. chemical cleaning method according to claim 1 or 2, wherein
In the cleaning process, the cleaning solution is discharged by the component from the upstream side end of the component, discharge The cleaning solution come is directly recycled to the end of downstream side of the component.
8. chemical cleaning method according to claim 1 or 2, wherein
The chemical cleaning method also has following process:
Measurement process measures the concentration of iron in the cleaning solution in the measurement process；And
Judgment step is based on the concentration of iron, in the judgment step to judge to remove the removal of the iron rust from the component Situation,
In the cleaning process, the cleaning solution is discharged from the cleaning object equipment, in the measurement process, measurement The concentration of iron in the cleaning solution ejected,
It is judged as in the case that the concentration of iron is normal concentration or more or is judged as concentration gradient in the judgment step Variable quantity be prescribed limit in value in the case where, terminate the cleaning process.
9. a kind of chemically-cleaning device is used to carry out chemistry to the cleaning object equipment with the component for being attached with iron rust skin clear It washes, wherein
The chemically-cleaning device will be used as the cleaning object equipment inside the fiery furnace wall tubes of direct current cooker,
The chemically-cleaning device has:
Spray tank accommodates cleaning solution of pH in the range of 4~8, and the cleaning solution includes rust remover, and the rust remover is chela The mixture of mixture, reducing agent or the chelating agent and the reducing agent, the chelating agent are amino acid system chelating agent, hydroxy acid Be any one of chelating agent and organic phosphorus chelating agent, the reducing agent be metal ion, sulphite, oxalic acid, formic acid, Any one of ascorbic acid, pyrogallol, hydrazine, hydrogen；
Medical fluid supply pipeline links the cleaning object equipment and the spray tank, and described clear to component supply Washing lotion；
Pump, is set to the medical fluid supply pipeline；
Medical fluid discharge pipe links the cleaning object equipment and the spray tank, and by the cleaning solution from the structure Part discharge；
The region for being at least attached with the iron rust in the component is set to be impregnated in the mechanism in the cleaning solution；And
The oxidation-reduction potential of the cleaning solution in cleaning is maintained the value for dissolving out the iron rust in the cleaning solution Mechanism,
The spray tank, the medical fluid supply pipeline and the pump are the mechanisms that the cleaning solution is supplied to the component.
10. chemically-cleaning device according to claim 9, wherein
The chemically-cleaning device has reducing atmosphere adjustment section, which is adjusted to described value in silver-chlorine Change under silver electrode benchmark as the value in -0.8V or more and the range of -0.4V or less.
11. chemically-cleaning device according to claim 9 or 10, wherein
The reducing atmosphere adjustment section supplies reducing atmosphere gas to the cleaning object equipment.
12. chemically-cleaning device according to claim 9 or 10, wherein
The temperature to the cleaning solution of the component is supplied more than the environment temperature on the periphery of the component and than the ring In range below high 10 DEG C of the temperature of border temperature.
13. chemically-cleaning device according to claim 9 or 10, wherein
The chemically-cleaning device is also equipped with circulation loop, which supplies the medical fluid of upstream side across the pump It is linked up to the medical fluid supply pipeline in pipeline and downstream side,
The a part for having passed through the cleaning solution of the pump is transported to the upstream side of the pump via the circulation loop.
14. chemically-cleaning device according to claim 9 or 10, wherein
In cleaning, stops supplying the cleaning solution to the component and the cleaning solution is discharged from the component, to make The cleaning solution is stood.
15. chemically-cleaning device according to claim 9 or 10, wherein
The chemically-cleaning device is also equipped with water supply unit, which has: accommodating the water tank of water；By the water tank and institute State the water supplying pipe line of cleaning object equipment connection；And it is set to the jet water pump of the water supplying pipe line.
16. chemically-cleaning device according to claim 9 or 10, wherein
In cleaning, following steps are repeated: the cleaning solution in the component being made to pass through the medical fluid discharge pipe towards institute State spray tank discharge；And the cleaning solution in the spray tank is made to be delivered to the structure by the medical fluid supply pipeline Part.
17. chemically-cleaning device according to claim 9 or 10, wherein
The chemically-cleaning device has circulation portions, which has: by the upstream side end of the component and downstream side The pipeloop of portion's connection；And it is set to the circulating pump of the pipeloop,
In cleaning, by the pipeloop, make the cleaning solution being discharged from the end of downstream side to the upstream side End circulation.
18. chemically-cleaning device according to claim 9 or 10, wherein
The chemically-cleaning device is also equipped with judging part, the redox of the cleaning solution of the cleaning object equipment is electric During position is maintained the value for dissolving out the iron rust in the cleaning solution and cleans to the cleaning object equipment, institute Judging part is stated based on from the concentration of iron in the cleaning solution that the cleaning object equipment is discharged, to judge to dissolve out from the component The removal situation of the iron rust in the case where being judged as that the concentration of iron is normal concentration or more or is being judged as concentration ladder In the case that the variable quantity of degree is the value in prescribed limit, terminate the cleaning of the cleaning object equipment.
CN201580028213.8A 2014-07-04 2015-06-17 Chemical cleaning method and chemically-cleaning device Active CN106414805B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2014-139043 2014-07-04
JP2014-139044 2014-07-04
JP2014139043A JP5721888B1 (en) 2014-07-04 2014-07-04 Chemical cleaning method and chemical cleaning apparatus
JP2014139044A JP6522293B2 (en) 2014-07-04 2014-07-04 Chemical cleaning method and chemical cleaning apparatus
PCT/JP2015/067439 WO2016002516A1 (en) 2014-07-04 2015-06-17 Chemical washing method and chemical washing device

Publications (2)

Publication Number Publication Date
CN106414805A CN106414805A (en) 2017-02-15
CN106414805B true CN106414805B (en) 2019-03-22

Family

ID=55019063

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201580028213.8A Active CN106414805B (en) 2014-07-04 2015-06-17 Chemical cleaning method and chemically-cleaning device

Country Status (5)

Country Link
CN (1) CN106414805B (en)
PH (1) PH12016502379A1 (en)
SG (1) SG11201610066TA (en)
TW (1) TWI599411B (en)
WO (1) WO2016002516A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3057428C (en) * 2017-05-02 2021-11-16 Halliburton Energy Services, Inc. Nanosized particulates for downhole applications
JP7051474B2 (en) * 2018-02-09 2022-04-11 三菱重工業株式会社 Chemical cleaning equipment and chemical cleaning method using it
JP6914987B2 (en) * 2019-04-26 2021-08-04 三菱パワー株式会社 Chemical cleaning method and chemical cleaning equipment
CN112108464B (en) * 2020-07-22 2022-05-10 岭东核电有限公司 Chemical cleaning device and method

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5785980A (en) * 1980-11-17 1982-05-28 Hitachi Ltd Method for removal of oxide on metallic surface
JPS58210200A (en) * 1982-06-02 1983-12-07 Hitachi Ltd Method for dissolving iron oxide film
JPS59232279A (en) * 1983-06-13 1984-12-27 Hitachi Ltd Removing method of oxide on metallic surface
US4789406A (en) * 1986-08-20 1988-12-06 Betz Laboratories, Inc. Method and compositions for penetrating and removing accumulated corrosion products and deposits from metal surfaces
JP2625123B2 (en) * 1987-07-17 1997-07-02 三菱重工業株式会社 Chemical cleaning method for poorly soluble scale
US5037483A (en) * 1990-01-30 1991-08-06 Nalco Chemical Company On-line iron clean-up
US7018965B2 (en) * 2003-09-03 2006-03-28 General Electric Company Aqueous compositions for cleaning gas turbine compressor blades
JP5924895B2 (en) * 2011-09-29 2016-05-25 三菱日立パワーシステムズ株式会社 Metal filter cleaning method, metal filter cleaning device, and metal filter cleaning liquid
CN103498164A (en) * 2013-09-04 2014-01-08 大连理工大学 Environment-friendly cleaning liquid and cleaning method for oxide layer of hot-rolled steel plate

Also Published As

Publication number Publication date
WO2016002516A1 (en) 2016-01-07
SG11201610066TA (en) 2017-01-27
TW201615293A (en) 2016-05-01
CN106414805A (en) 2017-02-15
TWI599411B (en) 2017-09-21
PH12016502379A1 (en) 2017-02-20

Similar Documents

Publication Publication Date Title
JP6522293B2 (en) Chemical cleaning method and chemical cleaning apparatus
CN106414805B (en) Chemical cleaning method and chemically-cleaning device
CN109113692B (en) Matrix-fracture dual-medium huff-puff physical simulation device and method for evaluating recovery ratio in huff-puff process
CN102494328B (en) Boiler cleaning process
JP5721888B1 (en) Chemical cleaning method and chemical cleaning apparatus
CN102418104A (en) Chemical for cleaning boiler, using method and cleaning device thereof
CN109323981A (en) Experimental system and experimental method for the aqueous corrosion experiment that is carbonized
CN108195223A (en) A kind of offline pickling descaling system of heat exchanger and technique
CN209148690U (en) A kind of long-term leaching test device for simulating waste residue concrete under sea conditions
CN102031480B (en) Ferrous sulfide gas-phase passivation method
CN112858155B (en) Dynamic simulation test device and test method for corrosion of hollow copper conductor of generator
CN102102169A (en) Ferrous sulfide gas phase passivation device
CN212301496U (en) Solid corrosion inhibitor evaluation system for oil-gas well
CN102374522B (en) Cleaning device for cleaning boiler
CN202338892U (en) Cleaning device for cleaning boiler
CN110132046B (en) Chemical cleaning device and chemical cleaning method using same
CN102908888A (en) Cleaning and passivating device, method and application for ferrous sulfide and hydrothion-containing gas
JP6370651B2 (en) Chemical solution preparation method, chemical solution preparation apparatus, and chemical cleaning method
RU2516849C1 (en) Method of studying procedure of tank cleaning from oil residues
CN101988179B (en) Gas-phase passivation system for petrochemical device
KR101328425B1 (en) Measuring method of corrosion and water quality using water-loof system in a heating system and water-loof system used the same
KR101584248B1 (en) System and method for measuring net acidity of mine drainage
CN102154612A (en) Gas phase deactivation method for petrochemical device
CN110899262A (en) Device suitable for offshore platform chemical washing, oil washing and degreasing
CN205425958U (en) Wash device of flash stove

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CP01 Change in the name or title of a patent holder

Address after: Kanagawa Prefecture, Japan

Patentee after: Mitsubishi Power Co., Ltd

Address before: Kanagawa Prefecture, Japan

Patentee before: MITSUBISHI HITACHI POWER SYSTEMS, Ltd.

CP01 Change in the name or title of a patent holder